I've just noticed similar errors scrolling past in the console on 14.6.1 -- which freaked me out a bit. Thank you for this thread, which has at least reassured me that it's likely to be a bug and not dark forces at work!
elegantchaos
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I found that I had to bridge to AppKit (see the highcaffeinecontent link above), then use a proxy to replace the window delegate and redirect the implementation of windowShouldClose: to a different object.Which seems like a sledgehammer to crack a nut, but...