Copycat pressure plates and buttons have entity collision, meaning they block entity movement.
This differs from ordinary pressure plates and buttons, which do not have entity collision.

To demonstrate for pressure plates, place a vanilla pressure plate on a fence post, and a copycat pressure plate on a second fence post.
You can walk all the way up to the fence post through the vanilla pressure plate, but the copycat pressure plate stops you from doing so.

Apologies if this is an intended feature.

Mod Version: copycats 1.1.0-mc1.19.2 (forge)