Wrong used & remaining disk space

Yes I think so. From my experience the software does not recreate single database but only whole set.
So what you want to do is to shutdown the node, then move all databases into a new directory that you create. Then start the node. It should create all new databases now, which you can delete except piece_spaced_used.db. This is the one you want to keep. So you shutdown the node again, delete the other databases and move the old databases from the folder you had created back to their original place.
Sounds complicated but is quite easy.

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