I'm sure it's a conflict somewhere, but as my pack has over 250 mods, I'm not taking the time to test each individual mod to see where the conflict is. I don't have any error information or anything like that, cause there's no errors printed and no crashes caused...it just causes the deathstate of a player who has died to stay in perma-death. So upon respawning, you immediately are dead again. Teleporting somewhere else doesn't help. Creative mode/op doesn't help. The only thing that fixes it is deleting the playerdata.

This is the version of the pack that has this issue: https://minecraft.curseforge.com/projects/jakspack/files/2547306

I can't run the modpack so I can't test it. I don't have enough ram

But, I'm pretty sure it's not my mod that's causing this. I don't touch the player death / respawn or whatever.

I run it with 6gb.

I all I know is that we have the issue with PB installed, and don't have the issue when it isn't. *shrug* I just wanted you to know, and so anybody else who might be wanting to use the mod/add it to a pack knows that there is a conflict somewhere. I really wish I had more information to share, but as I said...there is no log/crash info and no errors being printed in client or server side. The only way I was able to determine which mod was causing the immediate issue was by process of elimination from my pack's last update.

BTW, this happens in singleplayer as well as multiplayer (we don't use sponge, so it's not that either)

I run it with 6gb.

sadly I have only 6gb so can't go over 5gb :/

Only after deleting player data in my experience...but I never attempted removing Potion Core obviously

Do you have potion core installed in the pack? Seems like is some kind of incompatibility with it.

Yes. One of the mods we are running in my pack requires it.

It is then. The PotionCore causes it. just tested it.
I'll try to reach the dev and talk with him

Removing one of the mods will make the player be able to respawn properly again?

Sadly I got no response from the Potion core guy.
I'll try again

I know, but I can't do anything

Well, since you can reproduce it, you can try removing parts of your code until it stops looping. I'd start with events, EventPlayerClone specifically. And here's the source of PotionCore: https://github.com/Tmtravlr/PotionCore , it may also help.

I confirm the death loop. Having only these two mods installed reproduces the bug.