without gem of %attribute increase:

with

mobs that spawn with affix helmets with this gem do this as well

This is caused by a cross-mod interaction with (I think) passive skill tree. The gem increases all stats, and they have a fuckton of stats (and they are not zero-indexed), so the gem increases all of them, leading to this.

I will report it to them. Thanks.
Apologies for bugging you with it.
And yes, I have passive skill tree.

Maybe a config whitelist or blacklist for whether or not an attribute should be affected by all attribute increases would be good catch-all solution?

If desired one can datapack the gem to use a very long multi_attribute bonus, but I don't plan on changing the default implementation.

Passive skill tree should ideally be using zero-indexed attributes.

I did already implement the same workaround, minus the large tooltip it works pretty well. Thanks for the tip.

In that case hopefully the skill tree report goes somewhere.

@muon-rw Would you kindly be willing to share your datapack workaround with me?
I am not as familiar with custom datapacks as i should be :/