I first discovered this when taking a protection IV netherite helmet to my anvil to add projectile protection II, however the minute I put the helmet in the red X symbol was displayed by the anvil. I attempted to combine multiple items with enchanted books as well as trying to combine enchanted books, and every time I was shown the red X even though multiple enchantments has been a game mechanic for years. This continued after uninstalling and reinstalling the application (java for mac os).
Linked issues
duplicates 1
Comments 3
Duplicate of MC-154025.
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We're tracking this issue in MC-154025, so this ticket is being resolved and linked as a duplicate.
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Some enchantments are mutually exclusive; only 1 type of protection can be applied at a time, just like how smite, bane of arthopods and sharpness can't be combined.
This is not a bug.