diff --git a/app/assets/javascripts/lib/utils/common_utils.js b/app/assets/javascripts/lib/utils/common_utils.js
index 6fa1e84c170..33cc807912c 100644
--- a/app/assets/javascripts/lib/utils/common_utils.js
+++ b/app/assets/javascripts/lib/utils/common_utils.js
@@ -190,7 +190,7 @@ export const insertText = (target, text) => {
   target.selectionStart = target.selectionEnd = selectionStart + insertedText.length;
 
   // Trigger autosave
-  $(target).trigger('input');
+  target.dispatchEvent(new Event('input'));
 
   // Trigger autosize
   const event = document.createEvent('Event');
diff --git a/changelogs/unreleased/40373-fix-issue-note-submit-disabled-on-paste.yml b/changelogs/unreleased/40373-fix-issue-note-submit-disabled-on-paste.yml
new file mode 100644
index 00000000000..e683e60397e
--- /dev/null
+++ b/changelogs/unreleased/40373-fix-issue-note-submit-disabled-on-paste.yml
@@ -0,0 +1,6 @@
+---
+title: Fix Issue comment submit button being disabled when pasting content from another
+  GFM note
+merge_request: 15530
+author:
+type: fixed