I've seen no bug reports for this so I assume its not been reported. I got a locate treasure quest and the quest was in town in the business zone, next to a POI which is probably a bug by itself. Anyway I started digging down and after digging one block I discovered a 1-5 block deep space under the POI. It covered the POI or the zone block. I tried this in several other locations and found other examples. The catch is it doesn't always happen everywhere all the time I discovered from digging down around other POIs.
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