Create: Connected copycat blocks connected textures are a little off at the corner connections.
At the top, got Create copycat panels.
At the bottom, got Create: Connected copycat slabs.

Tested with:
Minecraft version 1.20.1
Forge version 47.2.0
Mods:
create-1.20.1-0.5.1.f.jar
create_connected-0.4.2-mc1-20.1.jar

Ah I forgot to consider diagonal connections. Will fix in the next update.

Fixed in v0.5.0+