When ETL tries to process after upgrading specifically from K2 Five (5.2) May 2019 Cumulative Update FP3 to K2 Five (5.2) May 2019 Cumulative Update FP4, ETL becomes unresponsive and an error is visible in the ETW logs.
The following error is visible: “The formal parameter "@PageSize" was not declared as an OUTPUT parameter, but the actual parameter passed in requested output”.