I recently encountered this bug when importing a mxd in Pro.
BUG-000146074
Synopsis: Importing a map document from ArcMap 10.8.1 into ArcGIS Pro 2.9 and 2.9.1 results in layers with feature exclusions.
Description:
Importing a map document in Pro results in layers with feature exclusion sets that did not exist in the original map document. These are layers that are typically created by selecting features and choosing Make Layer from Selected Features from the layer right-click menu.
Steps to reproduce:
- Find or create a map document with at least one vector layer.
- Check the layer to make sure it is not a selection set.
- Close ArcMap and open Pro.
- Import the map document in Pro.
- Check the layer properties in the map table of contents. The source tab contains an information notification that the layer contains a subset of features. The Selection tab displays the Feature Exclusion Set and includes a checkbox to clear the list of excluded features.