Gitlab Repository compare: branch search not working

I’ve noticed a problem after updating (self hosted) Gitlab to the Community Edition v13.10.0

When I try to create merge request via navigating to Repository->Compare, and I try to select target branch, not all branches are listed there (OK as far, I have a lot of branches). But when I type the name of the branch, my branch doesn’t appear on the list. I’ve opened the ‘Network’ tab in the development tools (Chrome) and I see no request sent to the server.

Is this something that got broken in the newest version? Or the combo box works up to the certain number of branches, and after that you need to type the URL manually?