June CU Breaks UPA - If you patch the child farm and not the federated farm

In Microsoft IT we encountered an issue with patching our child farm that was federated to a UPA farm that was the RTM build (without the June CU). UPA service failed until we patched the UPA Federated farm to the June CU.

Here is a Matrix of what scenario works:

Error thrown when our farm was changed from consuming from JuneCU UPA to an RTM UPA:

User Profile Application Proxy failed to retrieve partitions from User Profile Application: Microsoft.Office.Server.UserProfiles.UserProfileApplicationNotAvailableException: No User Profile Application available to service the request. Contact your farm administrator.

 at Microsoft.Office.Server.Administration.UserProfileApplicationProxy.get_ApplicationProperties()

 at Microsoft.Office.Server.Administration.UserProfileApplicationProxy.get_PartitionIDs()

 at Microsoft.Office.Server.Administration.UserProfileApplicationProxy.IsAvailable(SPServiceContext serviceContext)

The SharePoint developer Team is aware of the bug and will be fixed in the August CU. Beware and plan accordingly for this scenario. Thanks!