ETL tool not exiting with 3.1.0

Platform: Windows 10
Version: 3.1.0

After invoking the ETL tool the process never exits cleanly, which means you must use CTRL-C to request the batch job terminate. It does not appear that the process is doing anything, and the ETL job does load data, but does not exit to terminate gracefully.

It is effectively hung at the end.
This is new behavior with the 3.1.0 release.