Place a loom. Make sure you're not standing on the top, and right click the loom with a block in your hand.

Expected behavior:

• The block is not placed and the loom gui is opened instead.

Broken behavior:

• The block is visually placed on top of the loom, and emits the sound event of block placing.
• The placement is "revoked" a tick later, and then the gui is opened.

It's not a big problem, but is shows the handling of loom functionality is improper (maybe it's handled server-side only). A example of proper implementation can be the Blast Furnace or Smoker in your mod.

Doesn't seem to be server side handling... not sure what's going on.