ArcGIS Pro and ArcMap refuse to split a polygon

Question

I have a polygon feature class in a file geodatabase that I'm attempting to Split into smaller polygons. I had no problems with the first 5 polyygons but the next ones just won't split. I've tried in closing and restarting the map session, starting a new session with no other data loaded, and compacting the file-gdb, in both ArcGIS Pro 2.6 and ArcMap 10.8.
In Pro the error is

Split failed. New geometry must intersect polylines and intersect
polygons in two or more places.

matt wilkie · Answer

Try running the Repair Geometry geoprocessing tool before Splitting or any other edit tool that is behaving strangely. Likely the geometry has one or more self intersecting boundary lines and the polygon topology is broken.
In this case 12 self interesecting lines were found and repaired. After that editing behaved as expected.

ArcGIS Pro and ArcMap refuse to split a polygon

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