A chains block tag maybe for Hanging Skeleton/Corpses to add support for other mods' chains

That's probably a good idea. Is there a common tag for chains or will I have to create a new one?

Also, the way it works right now is that it checks if some block is a subtype of Chain, so if someone codes their custom chain that way, it'll work right now.

Yeah, you would probably need to create a new one. And I just tried hanging the corpses earlier with modded chains, and all but one of them worked. So perhaps you don't even need to create the block tag at all. 🙂 (Edit: Or maybe create chains block tag for MineCell's elevator?)

But if you do, I have a chains block tag in my mod-pack and reordered it for you, if you like
https://pastebin.com/gxbSvuCr

Can you please modify the json to only include chains that are similar to vanilla's chains? Like the first two in the screenshot, and exclude the "bigger" ones. I'd use that for the elevator's chains :)

Here you go! :)

https://pastebin.com/rPJz6jr6

Thank you! Ah, I could have waited a bit longer with the latest update, just released it an hour ago. Guess I'll include this in the next release, thank you so much! 😃

Included an elevator_chains tag in f098b74! :)