Interesting... I had used this trick many times in the past, but assumed that with Tahoe it would put the icon in the little squircle jail it puts other default icons in if they don't conform to the new standards. Those end up looking really bad. I just tried it with a non-conforming icon and it seems to work.

Time to go icon hunting.

Even Apple has forgotten about this it seems. There are various places in the UI where this change is not respected, e.g. Stage Manager.

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