Modpack version: 1.83

I died in the deeper dark of the dark, but the Gravestone wasnt created. In the deathlog stands, that the grave is at 0; 0; 0, but that wasnt the case.

That sucks :/ Did you look both up and down from those coordinates as well, or the place your death waypoint was set?
Also, you can restore it with commands iirc - /tmg_restore [player] <timestamp>

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