If you destroy the vent using any method other than a pickaxe, a crash will occur.
TNT, drill block from Create mod, piston ...etc
1.20.1

Hi
Faced the same problem. Judging by the logs, the problem is in the methods calling GeothermalVentBlock.updateVentPower
crash-2024-10-31_06.08.36-server.txt
Here is a pull request for a fix #34