This includes things like shooting crossbows from the offhand with a sharpened tool, using immersive's railgun, etc. It might be better to add an attribute modifier to the player while they are holding the tool instead?

Can you try testing with the following?

1. Install this datapack into your world (unzip first): attack_all_mobs_test.zip
2. /summon pig ~ ~ ~ {NoAI:1,Health:6.01}
3. /function test:attack_all_mobs
4. If the pig does not die, the bug is confirmed fixed and/or now no longer applies to player attacks made through Evoker Fangs.
5. If the pig does die, the mod is increasing the damage that you deal via Evoker Fangs because you are holding a sharpened tool. In this case, your sharpened uses will decrease by a few dozen each time this is reproduced.

P.S. This is likely related to the Grindstone Sharper Tools mod.

Oops, I thought this was an issue tracker dedicated to grindstone sharper tools. Yes, I'm specifically referring to having a sharpened sword increasing all other types of damage.