When running a Geoprocessing Script Tool that modifies data (eGDB, fGDB) within a map, changes are not shown in the map without workarounds. This issue persists at Pro 3.1.0. Please expose a method in arcpy that allows for a MapView to be refreshed.
@JoshuaBixby, @GlenColgate1, @NSCHLAGE, @ArapahoeAdmin,