I ran some test code below which creates four feature classes in a test geodatabase using ArcPy geometries in ArcGIS Pro 2.9.2:
- MultiPartPolyGeom has one multipart polygon with two parts (one a 3-sided polygon and the other a 4-sided polygon)
- CircleGeom has one circular polygon which is a true curve
- IntersectGeom is the intersection of MultiPartPolyGeom and CircleGeom and is a multipart polygon with two parts - each of those parts has one side which is a true curve
- IntersectSinglePartGeom is intended to be the two parts of IntersectGeom exploded to create two single part polygons each with one side which is a true curve
import arcpy if arcpy.Exists(r"C:\temp\test.gdb"): arcpy.Delete_management(r"C:\temp\test.gdb") arcpy.CreateFileGDB_management(r"C:\temp","test") arcpy.env.workspace = r"C:\temp\test.gdb" sr = arcpy.SpatialReference("WGS 1984") coordLists = [[(1.1,2.4),(4.9,2.6),(3.2,7.3)], [(6.1,8.8),(5.2,7.6),(7.1,2.3),(9.1,5.3)]] arrayList =  for coordList in coordLists: arrayList.append( arcpy.Array([arcpy.Point(*coords) for coords in coordList])) multiPartPolyGeom = arcpy.Polygon(arcpy.Array(arrayList),sr) arcpy.CopyFeatures_management(multiPartPolyGeom,"MultiPartPolyGeom") circleCenter = arcpy.Point(5, 3) circleCenterGeom = arcpy.PointGeometry(circleCenter,sr) circleGeom = circleCenterGeom.buffer(3) arcpy.CopyFeatures_management(circleGeom,"CircleGeom") intersectGeom = circleGeom.intersect(multiPartPolyGeom,4) arcpy.CopyFeatures_management(intersectGeom,"IntersectGeom") intersectGeomList =  for i in range(0,intersectGeom.partCount): intersectGeomList.append( arcpy.Polygon( arcpy.Array(intersectGeom.getPart(i)),sr)) arcpy.CopyFeatures_management(intersectGeomList,"IntersectSinglePartGeom")
After running the above code I added the resultant feature classes to a Map in ArcGIS Pro 2.9.2:
Although I expected IntersectSinglePartGeom (the purple feature class) to retain the two true curves from IntersectGeom (the green feature class) they collapsed to a straight edge.
When I first wrote this code and used it at about ArcGIS Pro 2.2 the two true curves were retained.
Consequently, I plan to report this as a bug to Esri Technical Support but assuming it is a bug can anyone anyone think of a workaround which will enable me to to get my expected result of IntersectSinglePartGeom retaining the two true curves?