I'm not entirely sure if I'm fixing this in the right place, but I'm fairly
sure that this bit has to be set to zero at some point. Otherwise the loop
in workbench_material_chunk_select runs too often.

I'm a bit confused by the fact that workbench_material_chunk_select does
something with the last 12 bit, while DRWResourceHandle has the resource
id in the lower 9 bits. Not sure what is going on here. Hope this helps anyway.