I've experienced a repeated crash to desktop which occurred shortly after beginning to fill a fluid vessel with lava.

The vessel was configured to have the see-through walls.

Set-up consisted of a hose pulley connected to a Create Pump connected to the fluid vessel. Crash subsequently re-created in creative world, with flywheel disabled just in case.

Shaders were not active.

Version 1.1.7-mc1.20.1 of Create: Connected was being used.

Online Crash report

Isolated/Test-world Crash report

This happens with Seared Stone from Tconstruct too, might be any light emitting fluid?

Figured out what my issue was causing this, is your Create version 6.0.5? Because 1.1.5+ of connected only work for Create 6.0.6