The Server Connection Test includes a test where a JDBC session is created in jdbcisql, and then jdbcisql is killed (CTRL-C). After 30 - 50 minutes, that session is expired by the system and it is removed from the Sessions panel in the Console.

I noticed some time later that a query, belonging to the now gone session, was still showing up in the Queries panel. Several others are also hanging around. One was submitted over 2 hours earlier.

Refreshing the Console's panels does not help. Stopping and starting the Console doesn't help, either.

The queries should be removed from the system at (roughly) the same time the session is expired, or terminates on its own.