I fixed about 10% of the “issues” and found that most of them require minimal movement of one node. It seems some mappers don’t like buildings to share nodes, so they try to keep a tiny gap in between. Sometimes however it’s not a tiny gap but a tiny overlap, and these are most of the tasks listed. Maybe you could run the search for overlapping buildings again, but with a minimum overlap (say 1 m) below which it is not considered an issue and won’t appear in the task list? In this way we could more quickly fix the few major ones.