I obtained a sharpness level 1000 sword with commands, but when I hold my mouse above the sword, in place of showing sharpness 1000, the game shows the string I entered in the command, "id:sharpness,lvl:1000"
my language settings are set to Nederlands (Nederland), maybe this is important
It could happen also to other enchantments and items, but Ididn't test it.
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Enchantment Level 1000 is not supported, see MC-10755.