Vangelis Evangelou <evangelou@gmail.com> writes:

> Honestly, I don't know. I'm using XFCE, which is not an unusual window
> manager. I can try and change some settings if you can suggest to
> diagnose the issue. I believe the ebuffers code has changed
> recently. It used to work without issues in emacs 27 or 28 (I don't
> remember which).

Would you try building with --with-x-toolkit=no?  I cannot reproduce
this on GNOME, but also can't be certain that this is not a result of my
using a no toolkit build.