TL;DR:
But… if you want:
The same issue as some user and I have had like month ago. You can probably safely remove KDE runtime 6.6, because it looks like obsolete, but just in case see System Flatpak Runtimes EOF for details.
For Gnome 45 runtime and looking at upstream Clipper bug tracker, they are already working on this fix, but it looks like program is having some issue with newer runtimes.