This issue is non-reproducible when the feature class is published using ArcGIS Pro 3.3.x to ArcGIS Enterprise 11.1.
解决办法
Publish the layer as a web map to retain the layer's copyright information when viewed in Map Viewer and Map Viewer Classic.
On the item details page of the web layer, open the metadata editor and click Resources > Details > Description and scroll down to Credits. Change 'Map Copyright' to 'Layer Copyright'.