A published layer from ArcGIS Pro with a projection other than the default (WKID 102100) is unable to be added as a feature service to ArcGIS StoryMaps.
This issue is no longer reproducible as of April 17 2023.
対処法
Project the coordinate system of the feature class back to Web Mercator (102100) in ArcGIS Pro.
Ensure the basemap in ArcGIS Pro is also in Web Mercator.
Republish the layer to ArcGIS Online.
Add the published hosted feature layer to a web map, and add to ArcGIS StoryMaps. The data now loads as expected when adding as a feature service in ArcGIS StoryMaps.