diff --git a/wp-includes/l10n/class-wp-translation-file-mo.php b/wp-includes/l10n/class-wp-translation-file-mo.php
index 3f5e72597c..f50c0ec1cf 100644
--- a/wp-includes/l10n/class-wp-translation-file-mo.php
+++ b/wp-includes/l10n/class-wp-translation-file-mo.php
@@ -154,7 +154,7 @@ class WP_Translation_File_MO extends WP_Translation_File {
 			// Metadata about the MO file is stored in the first translation entry.
 			if ( '' === $original ) {
 				foreach ( explode( "\n", $translation ) as $meta_line ) {
-					if ( '' === $meta_line ) {
+					if ( '' === $meta_line || ! str_contains( $meta_line, ':' ) ) {
 						continue;
 					}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 28f00871ae..d678e5d561 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.7-alpha-58921';
+$wp_version = '6.7-alpha-58922';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.