If you place your auto-chests in conveyor mode in a shed and go into decor mode, then move the chests around and rearrange them back into a conveyor belt, the belt ends up looking all wonky with broken textures. You'll also end up suddenly crashing at some point later, my best guess is that's when one of your artisan tools finishes its work and tries to dump the product into this abomination.
I can reproduce the crash for #1105385747290280036 if necessary, but given the broken texture it seems that you shouldn't be allowed to move conveyor belts in decor mode in the first place.