diff --git a/app/assets/javascripts/discourse/app/components/d-editor.js b/app/assets/javascripts/discourse/app/components/d-editor.js
index 09b90e5246e..318a969bb6f 100644
--- a/app/assets/javascripts/discourse/app/components/d-editor.js
+++ b/app/assets/javascripts/discourse/app/components/d-editor.js
@@ -390,6 +390,8 @@ export default Component.extend(TextareaTextManipulation, {
 
       this.set("preview", cooked);
 
+      let previewPromise = Promise.resolve();
+
       if (this.siteSettings.enable_diffhtml_preview) {
         const cookedElement = document.createElement("div");
         cookedElement.innerHTML = cooked;
@@ -407,40 +409,34 @@ export default Component.extend(TextareaTextManipulation, {
           true
         );
 
-        loadScript("/javascripts/diffhtml.min.js").then(() => {
-          // changing the contents of the preview element between two uses of
-          // diff.innerHTML did not apply the diff correctly
-          window.diff.release(this.element.querySelector(".d-editor-preview"));
+        previewPromise = loadScript("/javascripts/diffhtml.min.js").then(() => {
           window.diff.innerHTML(
             this.element.querySelector(".d-editor-preview"),
-            cookedElement.innerHTML,
-            {
-              parser: {
-                rawElements: ["script", "noscript", "style", "template"],
-              },
-            }
+            cookedElement.innerHTML
           );
         });
       }
 
-      schedule("afterRender", () => {
-        if (this._state !== "inDOM" || !this.element) {
-          return;
-        }
+      previewPromise.then(() => {
+        schedule("afterRender", () => {
+          if (this._state !== "inDOM" || !this.element) {
+            return;
+          }
 
-        const preview = this.element.querySelector(".d-editor-preview");
-        if (!preview) {
-          return;
-        }
+          const preview = this.element.querySelector(".d-editor-preview");
+          if (!preview) {
+            return;
+          }
 
-        // prevents any tab focus in preview
-        preview.querySelectorAll("a").forEach((anchor) => {
-          anchor.setAttribute("tabindex", "-1");
+          // prevents any tab focus in preview
+          preview.querySelectorAll("a").forEach((anchor) => {
+            anchor.setAttribute("tabindex", "-1");
+          });
+
+          if (this.previewUpdated) {
+            this.previewUpdated($(preview));
+          }
         });
-
-        if (this.previewUpdated) {
-          this.previewUpdated($(preview));
-        }
       });
     });
   },
diff --git a/app/assets/javascripts/discourse/app/lib/public-js-versions.js b/app/assets/javascripts/discourse/app/lib/public-js-versions.js
index f3bb8cde403..cf3a3bae11b 100644
--- a/app/assets/javascripts/discourse/app/lib/public-js-versions.js
+++ b/app/assets/javascripts/discourse/app/lib/public-js-versions.js
@@ -7,7 +7,7 @@ export const PUBLIC_JS_VERSIONS = {
   "Chart.min.js": "chart.js/3.5.1/Chart.min.js",
   "chartjs-plugin-datalabels.min.js":
     "chartjs-plugin-datalabels/2.0.0/chartjs-plugin-datalabels.min.js",
-  "diffhtml.min.js": "diffhtml/1.0.0-beta.18/diffhtml.min.js",
+  "diffhtml.min.js": "diffhtml/1.0.0-beta.20/diffhtml.min.js",
   "jquery.magnific-popup.min.js":
     "magnific-popup/1.1.0/jquery.magnific-popup.min.js",
   "pikaday.js": "pikaday/1.8.0/pikaday.js",
diff --git a/package.json b/package.json
index 18021b9d5b9..c1302beb5a0 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,7 @@
   "author": "Discourse",
   "license": "GPL-2.0-only",
   "dependencies": {
+    "@discourse/itsatrap": "^2.0.10",
     "@fortawesome/fontawesome-free": "5.11.2",
     "@highlightjs/cdn-assets": "^10.6.0",
     "@json-editor/json-editor": "^2.5.2",
@@ -21,7 +22,7 @@
     "bootstrap": "v3.4.1",
     "chart.js": "3.5.1",
     "chartjs-plugin-datalabels": "^2.0.0",
-    "diffhtml": "^1.0.0-beta.18",
+    "diffhtml": "^1.0.0-beta.20",
     "eslint-config-discourse": "^1.1.8",
     "handlebars": "^4.7.7",
     "jquery": "3.5.1",
@@ -41,8 +42,7 @@
     "workbox-expiration": "^4.3.1",
     "workbox-routing": "^4.3.1",
     "workbox-strategies": "^4.3.1",
-    "workbox-sw": "^4.3.1",
-    "@discourse/itsatrap": "^2.0.10"
+    "workbox-sw": "^4.3.1"
   },
   "devDependencies": {
     "@arkweid/lefthook": "^0.7.2",
diff --git a/public/javascripts/diffhtml.min.js b/public/javascripts/diffhtml.min.js
index 292f2654b5f..d81e24a0881 100644
--- a/public/javascripts/diffhtml.min.js
+++ b/public/javascripts/diffhtml.min.js
@@ -1 +1 @@
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diff --git a/yarn.lock b/yarn.lock
index 7bf8c178c36..5a85d58f95d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -14,13 +14,6 @@
   dependencies:
     "@babel/highlight" "^7.10.4"
 
-"@babel/code-frame@^7.12.13":
-  version "7.12.13"
-  resolved "https://registry.yarnpkg.com/@babel/code-frame/-/code-frame-7.12.13.tgz#dcfc826beef65e75c50e21d3837d7d95798dd658"
-  integrity sha512-HV1Cm0Q3ZrpCR93tkWOYiuYIgLxZXZFVG2VgK+MBWjUqZTundupbfx2aXarXuw5Ko5aMcjtJgbSs4vUGBS5v6g==
-  dependencies:
-    "@babel/highlight" "^7.12.13"
-
 "@babel/generator@^7.11.5":
   version "7.11.6"
   resolved "https://registry.yarnpkg.com/@babel/generator/-/generator-7.11.6.tgz#b868900f81b163b4d464ea24545c61cbac4dc620"
@@ -30,26 +23,6 @@
     jsesc "^2.5.1"
     source-map "^0.5.0"
 
-"@babel/generator@^7.13.0":
-  version "7.13.0"
-  resolved "https://registry.yarnpkg.com/@babel/generator/-/generator-7.13.0.tgz#bd00d4394ca22f220390c56a0b5b85568ec1ec0c"
-  integrity sha512-zBZfgvBB/ywjx0Rgc2+BwoH/3H+lDtlgD4hBOpEv5LxRnYsm/753iRuLepqnYlynpjC3AdQxtxsoeHJoEEwOAw==
-  dependencies:
-    "@babel/types" "^7.13.0"
-    jsesc "^2.5.1"
-    source-map "^0.5.0"
-
-"@babel/helper-create-class-features-plugin@^7.13.0":
-  version "7.13.0"
-  resolved "https://registry.yarnpkg.com/@babel/helper-create-class-features-plugin/-/helper-create-class-features-plugin-7.13.0.tgz#28d04ad9cfbd1ed1d8b988c9ea7b945263365846"
-  integrity sha512-twwzhthM4/+6o9766AW2ZBHpIHPSGrPGk1+WfHiu13u/lBnggXGNYCpeAyVfNwGDKfkhEDp+WOD/xafoJ2iLjA==
-  dependencies:
-    "@babel/helper-function-name" "^7.12.13"
-    "@babel/helper-member-expression-to-functions" "^7.13.0"
-    "@babel/helper-optimise-call-expression" "^7.12.13"
-    "@babel/helper-replace-supers" "^7.13.0"
-    "@babel/helper-split-export-declaration" "^7.12.13"
-
 "@babel/helper-function-name@^7.10.4":
   version "7.10.4"
   resolved "https://registry.yarnpkg.com/@babel/helper-function-name/-/helper-function-name-7.10.4.tgz#d2d3b20c59ad8c47112fa7d2a94bc09d5ef82f1a"
@@ -59,15 +32,6 @@
     "@babel/template" "^7.10.4"
     "@babel/types" "^7.10.4"
 
-"@babel/helper-function-name@^7.12.13":
-  version "7.12.13"
-  resolved "https://registry.yarnpkg.com/@babel/helper-function-name/-/helper-function-name-7.12.13.tgz#93ad656db3c3c2232559fd7b2c3dbdcbe0eb377a"
-  integrity sha512-TZvmPn0UOqmvi5G4vvw0qZTpVptGkB1GL61R6lKvrSdIxGm5Pky7Q3fpKiIkQCAtRCBUwB0PaThlx9vebCDSwA==
-  dependencies:
-    "@babel/helper-get-function-arity" "^7.12.13"
-    "@babel/template" "^7.12.13"
-    "@babel/types" "^7.12.13"
-
 "@babel/helper-get-function-arity@^7.10.4":
   version "7.10.4"
   resolved "https://registry.yarnpkg.com/@babel/helper-get-function-arity/-/helper-get-function-arity-7.10.4.tgz#98c1cbea0e2332f33f9a4661b8ce1505b2c19ba2"
@@ -75,42 +39,6 @@
   dependencies:
     "@babel/types" "^7.10.4"
 
-"@babel/helper-get-function-arity@^7.12.13":
-  version "7.12.13"
-  resolved "https://registry.yarnpkg.com/@babel/helper-get-function-arity/-/helper-get-function-arity-7.12.13.tgz#bc63451d403a3b3082b97e1d8b3fe5bd4091e583"
-  integrity sha512-DjEVzQNz5LICkzN0REdpD5prGoidvbdYk1BVgRUOINaWJP2t6avB27X1guXK1kXNrX0WMfsrm1A/ZBthYuIMQg==
-  dependencies:
-    "@babel/types" "^7.12.13"
-
-"@babel/helper-member-expression-to-functions@^7.13.0":
-  version "7.13.0"
-  resolved "https://registry.yarnpkg.com/@babel/helper-member-expression-to-functions/-/helper-member-expression-to-functions-7.13.0.tgz#6aa4bb678e0f8c22f58cdb79451d30494461b091"
-  integrity sha512-yvRf8Ivk62JwisqV1rFRMxiSMDGnN6KH1/mDMmIrij4jztpQNRoHqqMG3U6apYbGRPJpgPalhva9Yd06HlUxJQ==
-  dependencies:
-    "@babel/types" "^7.13.0"
-
-"@babel/helper-optimise-call-expression@^7.12.13":
-  version "7.12.13"
-  resolved "https://registry.yarnpkg.com/@babel/helper-optimise-call-expression/-/helper-optimise-call-expression-7.12.13.tgz#5c02d171b4c8615b1e7163f888c1c81c30a2aaea"
-  integrity sha512-BdWQhoVJkp6nVjB7nkFWcn43dkprYauqtk++Py2eaf/GRDFm5BxRqEIZCiHlZUGAVmtwKcsVL1dC68WmzeFmiA==
-  dependencies:
-    "@babel/types" "^7.12.13"
-
-"@babel/helper-plugin-utils@^7.13.0":
-  version "7.13.0"
-  resolved "https://registry.yarnpkg.com/@babel/helper-plugin-utils/-/helper-plugin-utils-7.13.0.tgz#806526ce125aed03373bc416a828321e3a6a33af"
-  integrity sha512-ZPafIPSwzUlAoWT8DKs1W2VyF2gOWthGd5NGFMsBcMMol+ZhK+EQY/e6V96poa6PA/Bh+C9plWN0hXO1uB8AfQ==
-
-"@babel/helper-replace-supers@^7.13.0":
-  version "7.13.0"
-  resolved "https://registry.yarnpkg.com/@babel/helper-replace-supers/-/helper-replace-supers-7.13.0.tgz#6034b7b51943094cb41627848cb219cb02be1d24"
-  integrity sha512-Segd5me1+Pz+rmN/NFBOplMbZG3SqRJOBlY+mA0SxAv6rjj7zJqr1AVr3SfzUVTLCv7ZLU5FycOM/SBGuLPbZw==
-  dependencies:
-    "@babel/helper-member-expression-to-functions" "^7.13.0"
-    "@babel/helper-optimise-call-expression" "^7.12.13"
-    "@babel/traverse" "^7.13.0"
-    "@babel/types" "^7.13.0"
-
 "@babel/helper-split-export-declaration@^7.11.0":
   version "7.11.0"
   resolved "https://registry.yarnpkg.com/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.11.0.tgz#f8a491244acf6a676158ac42072911ba83ad099f"
@@ -118,23 +46,11 @@
   dependencies:
     "@babel/types" "^7.11.0"
 
-"@babel/helper-split-export-declaration@^7.12.13":
-  version "7.12.13"
-  resolved "https://registry.yarnpkg.com/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.12.13.tgz#e9430be00baf3e88b0e13e6f9d4eaf2136372b05"
-  integrity sha512-tCJDltF83htUtXx5NLcaDqRmknv652ZWCHyoTETf1CXYJdPC7nohZohjUgieXhv0hTJdRf2FjDueFehdNucpzg==
-  dependencies:
-    "@babel/types" "^7.12.13"
-
 "@babel/helper-validator-identifier@^7.10.4":
   version "7.10.4"
   resolved "https://registry.yarnpkg.com/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.4.tgz#a78c7a7251e01f616512d31b10adcf52ada5e0d2"
   integrity sha512-3U9y+43hz7ZM+rzG24Qe2mufW5KhvFg/NhnNph+i9mgCtdTCtMJuI1TMkrIUiK7Ix4PYlRF9I5dhqaLYA/ADXw==
 
-"@babel/helper-validator-identifier@^7.12.11":
-  version "7.12.11"
-  resolved "https://registry.yarnpkg.com/@babel/helper-validator-identifier/-/helper-validator-identifier-7.12.11.tgz#c9a1f021917dcb5ccf0d4e453e399022981fc9ed"
-  integrity sha512-np/lG3uARFybkoHokJUmf1QfEvRVCPbmQeUQpKow5cQ3xWrV9i3rUHodKDJPQfTVX61qKi+UdYk8kik84n7XOw==
-
 "@babel/highlight@^7.10.4":
   version "7.10.4"
   resolved "https://registry.yarnpkg.com/@babel/highlight/-/highlight-7.10.4.tgz#7d1bdfd65753538fabe6c38596cdb76d9ac60143"
@@ -144,33 +60,11 @@
     chalk "^2.0.0"
     js-tokens "^4.0.0"
 
-"@babel/highlight@^7.12.13":
-  version "7.12.13"
-  resolved "https://registry.yarnpkg.com/@babel/highlight/-/highlight-7.12.13.tgz#8ab538393e00370b26271b01fa08f7f27f2e795c"
-  integrity sha512-kocDQvIbgMKlWxXe9fof3TQ+gkIPOUSEYhJjqUjvKMez3krV7vbzYCDq39Oj11UAVK7JqPVGQPlgE85dPNlQww==
-  dependencies:
-    "@babel/helper-validator-identifier" "^7.12.11"
-    chalk "^2.0.0"
-    js-tokens "^4.0.0"
-
 "@babel/parser@^7.10.4", "@babel/parser@^7.11.5", "@babel/parser@^7.7.0":
   version "7.11.5"
   resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.11.5.tgz#c7ff6303df71080ec7a4f5b8c003c58f1cf51037"
   integrity sha512-X9rD8qqm695vgmeaQ4fvz/o3+Wk4ZzQvSHkDBgpYKxpD4qTAUm88ZKtHkVqIOsYFFbIQ6wQYhC6q7pjqVK0E0Q==
 
-"@babel/parser@^7.12.13", "@babel/parser@^7.13.0":
-  version "7.13.4"
-  resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.13.4.tgz#340211b0da94a351a6f10e63671fa727333d13ab"
-  integrity sha512-uvoOulWHhI+0+1f9L4BoozY7U5cIkZ9PgJqvb041d6vypgUmtVPG4vmGm4pSggjl8BELzvHyUeJSUyEMY6b+qA==
-
-"@babel/plugin-proposal-class-properties@^7.10.4":
-  version "7.13.0"
-  resolved "https://registry.yarnpkg.com/@babel/plugin-proposal-class-properties/-/plugin-proposal-class-properties-7.13.0.tgz#146376000b94efd001e57a40a88a525afaab9f37"
-  integrity sha512-KnTDjFNC1g+45ka0myZNvSBFLhNCLN+GeGYLDEA8Oq7MZ6yMgfLoIRh86GRT0FjtJhZw8JyUskP9uvj5pHM9Zg==
-  dependencies:
-    "@babel/helper-create-class-features-plugin" "^7.13.0"
-    "@babel/helper-plugin-utils" "^7.13.0"
-
 "@babel/template@^7.10.4":
   version "7.10.4"
   resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.10.4.tgz#3251996c4200ebc71d1a8fc405fba940f36ba278"
@@ -180,30 +74,6 @@
     "@babel/parser" "^7.10.4"
     "@babel/types" "^7.10.4"
 
-"@babel/template@^7.12.13":
-  version "7.12.13"
-  resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.12.13.tgz#530265be8a2589dbb37523844c5bcb55947fb327"
-  integrity sha512-/7xxiGA57xMo/P2GVvdEumr8ONhFOhfgq2ihK3h1e6THqzTAkHbkXgB0xI9yeTfIUoH3+oAeHhqm/I43OTbbjA==
-  dependencies:
-    "@babel/code-frame" "^7.12.13"
-    "@babel/parser" "^7.12.13"
-    "@babel/types" "^7.12.13"
-
-"@babel/traverse@^7.13.0":
-  version "7.13.0"
-  resolved "https://registry.yarnpkg.com/@babel/traverse/-/traverse-7.13.0.tgz#6d95752475f86ee7ded06536de309a65fc8966cc"
-  integrity sha512-xys5xi5JEhzC3RzEmSGrs/b3pJW/o87SypZ+G/PhaE7uqVQNv/jlmVIBXuoh5atqQ434LfXV+sf23Oxj0bchJQ==
-  dependencies:
-    "@babel/code-frame" "^7.12.13"
-    "@babel/generator" "^7.13.0"
-    "@babel/helper-function-name" "^7.12.13"
-    "@babel/helper-split-export-declaration" "^7.12.13"
-    "@babel/parser" "^7.13.0"
-    "@babel/types" "^7.13.0"
-    debug "^4.1.0"
-    globals "^11.1.0"
-    lodash "^4.17.19"
-
 "@babel/traverse@^7.7.0":
   version "7.11.5"
   resolved "https://registry.yarnpkg.com/@babel/traverse/-/traverse-7.11.5.tgz#be777b93b518eb6d76ee2e1ea1d143daa11e61c3"
@@ -228,15 +98,6 @@
     lodash "^4.17.19"
     to-fast-properties "^2.0.0"
 
-"@babel/types@^7.12.13", "@babel/types@^7.13.0":
-  version "7.13.0"
-  resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.13.0.tgz#74424d2816f0171b4100f0ab34e9a374efdf7f80"
-  integrity sha512-hE+HE8rnG1Z6Wzo+MhaKE5lM5eMx71T4EHJgku2E3xIfaULhDcxiiRxUYgwX8qwP1BBSlag+TdGOt6JAidIZTA==
-  dependencies:
-    "@babel/helper-validator-identifier" "^7.12.11"
-    lodash "^4.17.19"
-    to-fast-properties "^2.0.0"
-
 "@cnakazawa/watch@^1.0.3":
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/@cnakazawa/watch/-/watch-1.0.4.tgz#f864ae85004d0fcab6f50be9141c4da368d1656a"
@@ -1452,12 +1313,10 @@ diff@^4.0.2:
   resolved "https://registry.yarnpkg.com/diff/-/diff-4.0.2.tgz#60f3aecb89d5fae520c11aa19efc2bb982aade7d"
   integrity sha512-58lmxKSA4BNyLz+HHMUzlOEpg09FV+ev6ZMe3vJihgdxzgcwZ8VoEEPmALCZG9LmqfVoNMMKpttIYTVG6uDY7A==
 
-diffhtml@^1.0.0-beta.18:
-  version "1.0.0-beta.18"
-  resolved "https://registry.yarnpkg.com/diffhtml/-/diffhtml-1.0.0-beta.18.tgz#b5255f6eb9e358fa279b423ea7d168b061a9146d"
-  integrity sha512-DEsiAiSNxTE7vTpfRtT4SPm1cxQRahIbzvLXNKquOh95+BQOS24IGX6s7sJihYgk7XN6cYy2xqMwO+pEDWGtpg==
-  dependencies:
-    "@babel/plugin-proposal-class-properties" "^7.10.4"
+diffhtml@^1.0.0-beta.20:
+  version "1.0.0-beta.20"
+  resolved "https://registry.yarnpkg.com/diffhtml/-/diffhtml-1.0.0-beta.20.tgz#129b403fa152276c9b876188980ca0f9b2540351"
+  integrity sha512-xSSwGb2dkQsTc7Bl910iySH65PkzsCtowfVGMfrmc2fEwvYrhJUpIEIx+3mpZ1wMWVt+t/0ltVwrjQkMJotxLg==
 
 diffie-hellman@^5.0.0:
   version "5.0.3"