Fixed migration to support updating from 8.15rc (and before),8.15 final and 9.0rc1

src/Umbraco.Infrastructure/Migrations/Upgrade/UmbracoPlan.cs

@@ -222,6 +222,13 @@ namespace Umbraco.Cms.Infrastructure.Migrations.Upgrade
 
             //FINAL
             .As("{5060F3D2-88BE-4D30-8755-CF51F28EAD12}");
+
+
+            // This should be safe to execute again. We need it with a new name to ensure updates from all the following has executed this step.
+            // - 8.15 RC    - Current state: {4695D0C9-0729-4976-985B-048D503665D8}
+            // - 8.15 Final - Current state: {5C424554-A32D-4852-8ED1-A13508187901}
+            // - 9.0 RC1    - Current state: {5060F3D2-88BE-4D30-8755-CF51F28EAD12}
+            To<UpdateCmsPropertyGroupIdSeed>("{622E5172-42E1-4662-AD80-9504AF5A4E53}");
         }
     }
 }