Hi Scott,
The general sequence for how these polygons were created is below. I believe this is how the error can be replicated:
1) start with overall large polygon (property boundary)
2) use the Split tool to carve out polygons from the initial overall boundary (timber stands)
3) again use the Split tool to cut out a "donut" polygon, further splits from polygons in step 2
4) Merge multipart polygons together, including the donut polygons
5) use the Explode by Parts tool to explode just one of the donut polygons
No deletions occur (so not true donuts, per se) and topology is valid for no gaps or overlaps within the original step 1 polygon shape.
There are no curves or beziers. Possibly these were created using streaming but typically just point and click to add vertices.
Thanks,
Clinton