The documentation is not clear on this aspect. My containers do not handle the SIGTERM and SIGKILL signals, so I have no code that delays the shut down. Whenever I type the command in the subject line in PowerShell, the container goes away instantly, never transition into the "Terminating" state.
You should probably take a read of the official document covering this.
I assume this is the expected behaviour, your containers terminate instantly as you have no code to handle the termination.