If you have an enchanted compass with Curse of Vanishing and then you use a lodestone in it, the compass will lose its current enchantment (Curse of Vanishing)
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Comments 3
This is a bug, see MCPE-74016
MCPE-78366
Compass Enchantments
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That's not a bug, the compass became a Lodestone Compass, which can't be enchanted since they're only used with Lodestones.