copy/paste still sometimes fails in X11 with mutter 3.36.2
I'm running Mutter 3.36.2 on Ubuntu 20.04 under X11.
This version of mutter contains changes (!1206 (merged)) that were intended to fix occasional copy/paste failures as described in #1113 (closed). Unfortunately, even with these changes copy/paste operations still sometimes fail in an X11 session (though on Wayland they work fine). Specifically, if I open two LibreOffice Writer windows side by side and repeatedly copy text in the left window and attempt to paste it into the right window, then
if I copy/paste using context menu items, then every other paste operation fails to paste the text that was just copied. This is completely repeatable.
if I copy/paste using Ctrl+C and Ctrl+V, then approximately 1 in 20 paste operations fails similarly, unpredictably.