PC npc's buy stuff from rented vending machines?

I noticed a few alpha's back that there was something that would buy stuff from your rented vending machines and still does to this day. However in the new A21.1 they no longer buy bulked stone and other stuff like wood and iron?  Is this a patch or bug, it was my main way of making a lot of dukes?

 
Yeah it kind of made things trivial if people chose to do this if i wanted those dukes that easy id just go into cm i agree being overly powerful is fine but straight up exploits is what i dont like in many games but hey it is optional so there are a lot of counter arguments.

 
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