So the crash first happened when I placed down an encased fan and tried to pick it up again, trying to break the block with wrench/drill or pickaxe/axe seems to have made my game crash, so I blew it ...

Load up Create 1.17.1 (0.4) with Corruption (Java) 1.17.1 (1.0) Make a world Place a shaft, cogwheel, creative motor, large cogwheel ect.

Minecraft: Java Edition is currently testing the bug-fixing 1.17.1 update for the 'Caves and Cliffs Update.' It seems the update is close to a public release, as Mojang Studios has just dropped 1.17.1 ...