CCE (class cast exception) supression (alias shulker supression) is patch in the version, but nothing related to that is in the change log. The supression was relaying on the unsanitezed input to given by the shimker to a comparator cause an exception. This can't be done without modifying data of the shulker and currently the only way to get a shulker to do that is using supression, who was patch in 1.19. Cce was a great way to still have supression even in 1.19+.
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Here a link of a video explaining how to get it and it's use as a suppressor
Well, Mojang fixed it, they made their call. The time of death for this BUG has been given, and requesting any change to behavior here is a change request, which doesn't belong here.
Well you are right, mojang broke this feature, unfortunately. And what is a broken feature? It is called a bug. So the fix itself is a bug, an absolutely meaningless one
What is "CCE supression" means? I have never heard that before.