I feel macOS these days starts feeling like Windows in the 1990s where occasionally some core component of it breaks, and a reboot is necessary to restore it to full functionality again.

But even with that in mind: this happened literally right after the reboot, with nothing much happening and no other signs of the system in distress.

It’s hard for me to even understand what would make this kind of thing pop up. Trash feels like one of the core tenets of a GUI – like undo, or copy/​paste, or windows gaining focus. You don’t expect it to just… stop working, especially with a circular error message like the above.