I haven't installed Sigil from the Arch repositories in a long time, but I should be able to check it out easily enough. There is one crash reported for 1.9.10, but that shouldn't be because of anything that we've done on our end.
https://bugs.archlinux.org/?project=5&string=sigil
I doubt it's an
ALL Arch issue. My guess is another KDE or other DE specific problem. Those are always fun.
P.S. The latest version of Sigil doesn't
require Qt6. It CAN be built with Qt6 though. Even when we start shipping Windows and MacOS bundles with Qt6, I won't be requiring Qt6 on Linux. Packagers will be able to choose whether they want to package Sigil Qt5 or Sigil Qt5 for a while yet.