I discovered this while testing the mod in a Creative world. Here's the issue:

During an Autocaster's death sequence, they can be dismantled, which saves the Autocaster. I feel like this should be known, as they drop various components on death and this could be abused to farm resources.

Streamable with footage of this in action: https://streamable.com/3pgkmn

This actually can be done with any TC6 golem/entity (automated crossbows, arcane bore).'

Edit: Interestingly this can also be done in TC5. The bug got probably ported when Azanor brought golems to TC6.

If it's happening in Vanilla Thaumcraft, that sounds like a bug for the DupeFix Project.

Just reported it to them.