Applying Inapplicable Enchantment (i.e. Sharpness) to Trident Costs Extra Level

Hello Mojang,

I got an Impaling IV and Unbreaking III Trident from an Enchantment Table. I have an Enchanted Book with Riptide III and Sharpness III and another one with Riptide III only. Combining the Trident with the first book on an anvil costs 7 levels, but combining it with the second only costs 6 levels. From my understanding, Sharpness III is inapplicable to Tridents and thus should be ignored. Therefore, I believe this is a bug.

Steps to reproduce:

1. /gamemode survival

2. /give @p minecraft:trident[enchantments={impaling:4,unbreaking:3}]

3. /give @p minecraft:enchanted_book[stored_enchantments={riptide:3,sharpness:3}]

4. /give @p minecraft:enchanted_book[stored_enchantments={riptide:3}]

5. /give @p minecraft:anvil

6. Try combining the Trident with each of the two books

Please let me know if you need anything else from me. Thank you!

Regards,

Leo Li