diff --git a/wp-admin/js/customize-controls.js b/wp-admin/js/customize-controls.js
index 0496435e42..5656b41687 100644
--- a/wp-admin/js/customize-controls.js
+++ b/wp-admin/js/customize-controls.js
@@ -8461,6 +8461,13 @@
return;
}
+ // Abort if we're inside of a block editor instance.
+ if ( event.target.closest( '.block-editor-writing-flow' ) !== null
+ || event.target.closest( '.block-editor-block-list__block-popover' ) !== null
+ ) {
+ return;
+ }
+
// Check for expanded expandable controls (e.g. widgets and nav menus items), sections, and panels.
api.control.each( function( control ) {
if ( control.expanded && control.expanded() && _.isFunction( control.collapse ) ) {
diff --git a/wp-admin/js/customize-controls.min.js b/wp-admin/js/customize-controls.min.js
index b72aa2adc2..5bcdeacbb4 100644
--- a/wp-admin/js/customize-controls.min.js
+++ b/wp-admin/js/customize-controls.min.js
@@ -1,2 +1,2 @@
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