@postroutine @devnull It might worth in this case to report the information to the Krita bug tracker. But be sure to test the Krita 5.1.5(latest stable) in appimage version; and in X11 and not Wayland. Distribution packages are not well supported (rare or none are distro knowing how to build Krita with all the patch and against the correct library versions nowadays; the appimage solves that with upstream libs patched). Good luck!
@postroutine @devnull Also, I forgot, but if you use GNOME 44 (because Eog/Eyes of GNOME) the D.E. (Mutter) introduced a very big bug to all Qt applications, making Drag and Drop impossible (eg. moving layer in drag and drop, etc https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2984 ). Bugs can also comes from this part.