When both mods are installed game dont crash, but after correct configuration of claims,
Dim threds don't respect protection rules from claims. (tnt destroys protected chunks, fire spreed)

Link to the mod in question:
https://www.curseforge.com/minecraft/mc-mods/open-parties-and-claims

I have noticed this as well while using DimThread, it seems to be nearly entirely bypassing OPAC to mobs spawning and what not. Mod otherwise works great and helps preformance on servers a lot.