Problem: Put bone meal in hand and right click (to heal team) on a healer station. The bonemeal is consumed with each right click as if it were being placed on a plant.

Expected: I would expect bone meal to not be consumed by the healer and the team to heal as per usual.

This isn't a bug, but an actual game mechanic.

Healers use the same process as PCs and Trade Machines, etc, where you right click them with a dye, and it makes the item that colour. If you're healer is already white, you wont see a difference, however, if it is another colour, you will see it change back to white, since bonemeal is the equivalent to white dye in MC 1.12.2

When healing your team, just don't have and dye colours in your hand, and you'll be fine.