cannot repro i ran the steps and MultipartToSinglepart did not fail.
Most reliable way to insure the process is run the exact same way is to provide a model instead of manual steps.
also we don't recommend modifying the default xytolerance.
lastly processing of data with bad inputs is not recommended. The vp feature class provided contains self-intersecting polygons, those should be repaired before any analysis is done with the data.
解决办法
Run the Feature To Polygon tool, and then run the Multipart To Singlepart tool.