Skeleton Skulls Will gives Random Hitbox in the End

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What I expected to happen was: Making Something with the head:
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What actually happened was: I was Fighting the Dragon then i randomly put a skeleton skull in the end Then i find a random hitbox for the skull:
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Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. Skeletons Skull Doesnt Give the Same hitbox
3. Putting it in the end Gives you Random Skull