Thanks for looking into it, after investigating more the error only seem to happen after changing the pane size. I've put a video reproduction on github (not possible to post video here): https://github.com/kraktus/AppleScript-split-view-bug/issues/1 It's viewable in the browser.

Hello, Thank you for your answer, I have filled a report: https://feedbackassistant.apple.com/feedback/10445507 Regards,

Hello, Have found a solution? I'm facing the same issue and for now the only doc I could find is not very explicit about how to decode the backtrace: https://help.apple.com/instruments/developer/mac/current/#/dev15401019