Some users have reported an error when attempting to copy and paste feature classes from an enterprise geodatabase (See Image #1).
After looking at the domains in the geodatabase, we see that the correct number of domains is present in ArcGIS Pro, but absent in Arc Catalog which you can see in Image #2.
The same code snippet was run in ArcGIS Pro & Arc Catalog on the same geodatabase with different results.
gdb = r'PathToGDB'
arcpy.env.workspace = gdb
print len(arcpy.da.ListDomains())