We consistently see this error at the end of extension unit test runs - even when they all pass successfully.

The STDIO streams did not close within 10 seconds of the exit event from process '/bin/bash'. This may indicate a child process inherited the STDIO streams and has not yet exited.

It doesn't seem to affect the test run (the job completes successfully) but we should investigate whether this is something we can fix to remove clutter from the logs that may distract from real problems.