Had a gamecrash happen while dropping down a mineshaft close to my base.
Tried unloading and reloading the chunk the firepit was in to reproduce the issue. Could not reproduce it.

I am playing the modpack TerraFirmaCraft TNG - Base:
https://www.curseforge.com/minecraft/modpacks/terrafirmacraft-tng-base/files
which has TerraFirmaCraft version 1.12.2-1.7.11.169
With Optifine 1.12.2_HD_U_E3
and the shaders from: https://www.reddit.com/user/PalpableBrush26/comments/ifhnvk/terrafirmacraft_112_tng_seus_renewed_shaders/ installed.

Here is the crash log file:
crash-2021-02-26_14.20.06-client.txt