BAG has invalidated the request, the geometry was correct.
I'll revert these changes.

Exchanged with @eggie and OSM Discord, contacted the BAG to request confirmation of error in the data.

I'll revert my changes for the vertical line from 96 to 100 on the street if BAG invalidates my request.

The original rounded part of the building had thousands of points, which I cleaned up and reconnected for the maproulette challenge in the original comment.