Cmd-W also closes last terminal-Tab

I often use many Terminal Tabs and close them with Cmd+w after usage. Unfortunately also the last Tab gets closed by this command. If I try to get a new Terminal-Tab by hitting my TT-hotkey, nothing happens. I need to select “Open Visor” by mouse from the menuicon. The Hotkey mentioned there - similar to my hotkey - doesn’t work.
I set the Hotkey to F13.

Is this a bug or did I miss some settings?

This behaviour is by design.

Alternatively you can create new tab via CMD+T. I don’t do that automatically.