I guess this is not intended

Minecraft is very picky about what can and cannot have specific enchantments. I can of course work around this, but it has to be done specifically for each enchantment (for example smite on bludgeoning). Ideas on what items should be able to receive what enchants from vanilla are appreciated.

https://forums.minecraftforge.net/topic/96851-1164-custom-item-enchantability/

https://github.com/BobMowzie/MowziesMobs/blob/master/src/main/java/com/bobmowzie/mowziesmobs/server/item/ItemNagaFangDagger.java#L28

Fixed in 1.18, thanks @k1r0s for the help.