It would be helpful if there were a geoprocessing tool that could identify multipart features (FGDB).
Create a new FC with a field that flags features with multi-parts.
Calculate Geometry tool with "Number of parts" option gives you part count. You can easily select multipart records
https://pro.arcgis.com/en/pro-app/latest/tool-reference/data-management/calculate-geometry-attribute...
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