Exploring on the server in creative and server crashed
https://pastebin.com/jNVdbUfF
Unearthed-forge-1.18.1-2.0.1
Forge 39.0.59

Oh, F for Fabric users then. Fortunately I had the issue on Forge.

Fixed by the new version, but mind that the update will delete granite/andesite/diorite ore blocks on fabric (not on forge)

Same here. Happens crossing specific chunk, previously I had no issues.
crash-2022-02-08_18.46.53-server.txt
2022-02-08-4.log.gz
latest.log
I also use Terralith, TerraBlender and Repurposed Structures, if this makes any difference. Forge 1.18.1, Unearthed 2.0.1.

Also, I just wanted to say that I absolutely love how 1.18 looks with Unearthed. Makes Terralith gen so much more beautiful.

Experiencing the same on fabric