Forgot to update on the result.
Mod was outdated: Hyborian Age Rare Weaponry
For anyone that wants to know.
The mod also has not been updated in a while, and although it shouldnt technically have problems as it is “just adding weapons”, it also adds the hasta weapons (javelins that are not for throwing with their own animations) and I assume somewhere in all that is where the problem is with the new patch.
Thankfully it was like the 2nd or 3rd mod I tried and got away with a lot less testing than I expected.
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