Yes, that makes sense as your backtrace includes Accessibility events being delivered just before the abort is triggered.
Nice detective work. I will look into building that Rectangle and seeing if I can recreate the bug.
My guess is Default Folder X beta 6 is the real culprit as tries to override file dialogs. It should only work with native dialogs. Unfortunately, it is not open source and so I do not trust it not to capture and send home personal information, password or tracking data so I will not be installing it on my system. It requires screen capture privileges which can be dangerous.
And Rectangle already has bugs related to issues with Qt 6.5.x.
See:
https://github.com/rxhanson/Rectangle/issues/1145
and a related issue:
https://github.com/PrismLauncher/Pri...cher/pull/1131
And its snap windows capabilities even causes issues with some official Apple software.
Have you tried telling Rectangle to not apply itself to Sigil?