Per upstream bug, https://bugs.kde.org/show_bug.cgi?id=422426#c24 "Primary selection will still not work between QT-Wayland and e.g. Chromium or Pidgin. In order to fix that kwin will need to translate between primary selection of Wayland and X11 - that's not yet done..."
Confirmed. xfce-terminal (yes, using that one still) and other windows too. I have setup in clipboard settings to sync primary selection and clipboard to no avail.
Upstream patch: https://invent.kde.org/plasma/kwin/-/commit/6104dc50cfa4cfa6467029dfdad17c9848dc225c Can we please backport it to 5.22.5? There are no more 5.22 dot releases before 5.23.0 (which is still several weeks away).
I looked into backporting last week. Turns out there was a fair amount of code refactoring in 5.23 too that makes backporting difficult and impractical.
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