SCV 5.0P3 fails to update the SnapVault due to REST API Invoke error

Backups that trigger SnapVault fail to do so with the following errors in the protection service's Job-<JobID>.log:

[ERR]System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
 --->System.NullReferenceException: Object reference not set to an instance of an object.
   at NetApp.DataProtection.Storage.CommandAPI.SDK.NestedCall.NcSnapmirrorRestInterface.SnapmirrorUpdateOutputRestResponse(JTokenrecord, NcRestInterface ncRestInterface)
[DBG] [Request Method]: POST
[ERR] Failed to run a command Invoke-NcSnapmirrorUpdate
[DBG] ex.Message : Object reference not set to an instance of an object.
[DBG] [Response Location Header]:/api/snapmirror/relationships/<RELATIONSHIP_UUID>/transfers/<TRANSFER_UUID>
[INF] End GetSALCommandRenewConnectionObject
[DBG] [Response]: {
  "error": {
   "message": "entry doesn't exist",
   "code": "4",
   "target": "uuid"
  }
}

[ERR] ErrorCode (-1), ErrorMessage (Snapmirror update failed with SDError (102) - SnapMirror update operation failed.
Failed to update the SnapMirror relationship.
Object reference not set to an instance of an object.

Please check the Windows event log and SnapDrive logs for more details.Snapmirror update failed with SDError (102) - SnapMirror update operation failed.
Failed to update the SnapMirror relationship.
Object reference not set to an instance of an object.