There is such a modification, TieredZ, it allows you to get attribute-giving modifiers on the anvil. And this mod works perfectly with it, but there is one visual bug, it does not display vanilla negative attributes, for example -4 to health, but it still works, that is, if I put on armor, I will take away -4 health, but it is not displayed, this is only with armor from immersive armor.

TieredZ and immersive armor on version 1.20.1 fabric.

Merged with #79