Ticket #43657: 43657.2.diff

src/js/_enqueues/wp/widgets/custom-html.js

@@ -112 +112 @@
                          * to prevent the editor's contents from getting sanitized as soon as a user removes focus from
                          * the editor. This is particularly important for users who cannot unfiltered_html.
                          */
-                        control.contentUpdateBypassed = control.fields.content.is( document.activeElement ) || control.editor && control.editor.codemirror.state.focused || 0 !== control.currentErrorAnnotations;
+                        control.contentUpdateBypassed = control.fields.content.is( document.activeElement ) || control.editor && control.editor.codemirror.state.focused || 0 !== control.currentErrorAnnotations.length;
                         if ( ! control.contentUpdateBypassed ) {
                                 syncInput = control.syncContainer.find( '.sync-input.content' );
                                 control.fields.content.val( syncInput.val() ).trigger( 'change' );