No matter my gamemode or how I die, no gravestone is spawned for me whatsoever.

MC 1.19.2
Universal Graves 2.1.2+1.19.2
Quilt 0.4.4
Quilt Loader 0.17.6

latest.log (has mods list in it too)

@Brittank88 performing a thanos search (binary search. Remove half the mods, run, attempt to reproduce, if you can't then use other half, if you can talk half of the half, repeat) will only take on average 12 attempts to find the mod that causes it. This is because log2(242) * 3/2 ≈ 11.88. (Multiply by 3/2, because you will either need to start the server once, or twice, for each attempt. And the average of 1 and 2 is 3/2.)

Doing a binary search greatly reduces the number of times you need to restart the server.

Did you test it with empty inventory?

No, I made sure to have items on me.

Weirdly enough, the gravestones datapack by VanillaTweaks also isn't working...

Might be weird mod conflict then? Could you try removing mods until it works?

Would take a long while - the server has over 242 mods in it according to the startup log!

I've migrated to a feature of Fabricated instead that allows for the penalisation of XP loss whilst keeping your items keepInventory-style so that will suffice. Thanks for your quick responses though!

Yeah I figured, though, I have to account for slicing off library mods and keeping their dependents accidentally. Usually this is fine as it will tell me, but I've encountered crashes that don't even state the issue with relation to missing libs before.

Can close this now as it was actually another mod confusing the game into thinking the player had a totem of undying, even though they did not.