A cross post of this:
EdwinMindcraft/origins-architectury#34 (comment)

Minecraft: 1.16.5
Origins forge: Origins-1.16.5-0.7.3.5-forge
Forge: 36.1.24
Atum: Atum-1.16.5-2.2.5
[and many other mods...]

But I've made a couple of custom origins in origins forge that spawn directly in the atum naturally. But I'm having a weird issue that makes them unable to respawn on death 90% of the time.

I hit respawn but no error appears in console, no crash. Just a respawn button clicks in, then unclicks. When I try to exist to title I get an infinite dirt screen telling me it's saving game. and on end process and reload I'm still dead.

Although just now I managed to get one of my worlds to respawn luckily after waiting a while after a force restart of MC. I'm not sure what could cause it and what caused it to suddenly loosen up for me.

I don't wish to use the everyone spawns originally in Atum config option. I only want it for those it makes sense for. Could it be weird world loading or spawn condition issues?

Seems to be something they have to figure out on their end, with how to load Forge dimensions, before doing whatever they need to do.
Nothing that can be done on our end.

Welp.
So it's just forge dimensions/custom ones? not existing ones? since none of the other dimensions from vanilla have the issue it seems as far as I could tell, since I got wombo combo'd by a good number of times by endermen groups (till I got good) and had no such bug, so it's probably a safe assumption. :V
If world unloading is actually the issue, would you have an idea how to keep the dimension loaded atleast at the center of the map or spawn chunks etc? how do you do it to enable respawning in it using the config setting? Can that kind of thing be turned on without actually moving the entire world spawn there? or atleast delay the world somehow unloading the moment I get deleted despite myself being able to watch the apotheosis boss who slammed me just walk off casually and see it physically become day time while I'm waiting and hoping it unbugs?