When using tomes to create a set of books; Sharpness VI, Smite VI and Bane of Arthropods VI, you can then use the anvil to add them all to a sword in survival mode. Normally this is not allowed to happen.

Edit:
Allowing smite and sharpness at the same time for example.

You know this is a feature right?

This is not a feature.

I was told to open an issues by Vaskii abou this. Smite and sharpness should not be on the same item, this allows that.

oh my bad misread what you said