There seems to be a bug, where the storage system is NOT considering all items to be storable, when category definition being included.
E.g.

Pallet storage, which is declared to also include all building types, like
will NOT have the capability nor possibility to ever store for instance, power conduits, wood-fired generators, steam generators, and so on.
This is a nuisance. I don't have the nerves including every single item's thingdef one by one into the category. I had to do this with Dubs Bad Hygiene objects, making them, storable, despite those buildings being properly declared as buildings, Deep Storage is NOT able to recognize them at all.

The regular storage types (stockpile (vanilla), regular storage shelves etc.) are able to store them ... so what's the problem here? Is there a code segment inside the DLL hindering this stuff functioning at all?
There are no hints at the xml file cluster showing any signs of "disallow thingcategories" whatsoever.
And yes, even when removing all the other mods, it is still not capable of handling the buildings category properly.