The issue arose twice, after i placed a Gregtech Item pipe next to a Block that was being updated by EnderIO conduits. I have 2 files from separate worlds and separate incidents attached.
I have failed to reproduce the bug in any other way than with EnderIO conduits and the bug leads to world corruption and a ticking entity. I tried to restore the world with an NBT Editor, but failed to remove the ticking entity completely, so the bug is very impactful for the casual player and prevents the world files from being loaded.

No idea whether this issue needs to be solved by the mod creators, but I thought I'd mention it here.

crash-2023-11-24_13.38.06-server.txt
crash-2023-11-26_15.09.22-server.txt

This is my first Bug report, so forgive any lack of convention

You should probably report issues for Nomi-CEu to Nomi-CEu: Nomi-CEu/nomi-ceu/issues. This is Nomifactory, and it doesn't use GTCEu.

Oops, my bad, had the repositories mixed up