Update on this:
So disabling Toxicity by simply throwing a # into the main.txt that calls it to load shows the chat is no longer flooded with errors on reviving a player, so it seems to be exclusively tied to that mod and reviving.
However, I then noticed shortly afterward that Fish's dodgeroll reverts to vanilla after being revived(?) as he no longer flashes and get dizzy from overuse, on top of taking damage as usual.
Having a mod listen for revival is one option but would it not be more efficient to have the death and revive function not delete mod functionality?