Minecraft version 1.16.5
Forge version 36.2.0
Mod version 1.11.2

When using the tiny observer block, it does not pulse when facing a door, gate, or trapdoor that opens or closes, as the larger observer block does.

Thanks for the report! I'll look into how to make this happen. Doors and gates don't send block updates when they open and close, so I'll need to find a way to monitor neighboring block states for changes without adding too much overhead to the game tick. Vanilla observers seem to be registering for these updates somehow. The direction is assumed, though, so I'll probably need to take a different approach.