The Bug:

Attempting to feed brown mooshrooms with flowers that have already been fed plays the hand animation and produces particles.

As a result of this problem, the player cannot use items in their offhand while a flower is in their main hand. This previously was possible; see MC-222040.

Steps to Reproduce:

1. Summon a brown mooshroom by using the command provided below.

   /summon minecraft:mooshroom ~ ~ ~ {Type:"brown"}

2. Obtain a stack of any flowers, switch into survival mode and feed one to the mooshroom.
3. Attempt to feed the same mooshroom another flower.
4. Take note as to whether or not attempting to feed brown mooshrooms with flowers that have already been fed plays the hand animation and produces particles.

Observed Behavior:

The hand animation is played and particles are produced.

Expected Behavior:

The hand animation would not be played and particles would not be produced when attempting to feed brown mooshrooms with flowers that have already been fed.