Immersive engineering version: 1.16.5-4.2.1-131
Forge version: 1.16.5 36.0.42

Mod list:

The glitch: Chemthrower turrets try to shoot through blocks, causing particle lag, and wasting fuel.

Try using walls?

It might have something to do with how that specific area is set up. It does not reproduce with just walls

I can't reproduce this. I see the chemthrower turret aiming but it does not shoot:

Please provide some pictures of your testcase.