Chompy dissapears when stacked

Affected Service (Game name, hub, or global):
Skywars Luckyores Solo

What is the bug?
I had one Chompy in my inventory, and 2 more fell out of the chest. When I tried to put them in same slot in my inventory, they all combined into one and I lost 2 of them.

Device(s) & Version
Windows 11, Minecraft 1.21.30

Screenshots and/or video:

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