NSSavePanel Crashes on Big Sur for public.csv UTI When You Don't Have a CSV Editor
Was working on an export sheet today and during testing on Big Sur, I noticed that the button that would bring up the save panel would produce a beachball for a while, and then I’d get an error dialog telling me that the panel crashed. I changed the NSSavePanel.allowedFileTypes property to ["public.csv"] during this update, and that trips up the save panel on Big Sur. Note that ["csv"] works just fine.