Can't use Hardening Catalyst with mod armor

[v1-c705]

Minecraft Version: 1.21.1
Mod Version: 0.4.2

Issue: I cannot combine Hardening Catalyst with Aeternium Armor from BetterEnd mod, but I can, for instance, combine it with the Aeternium Pickaxe.

Is there a way to foncefuly give the item an unbreakable atribute with commands to bypass this limitation?