Terminal process remains on background after exiting it

[hwooo]

Environment

Windows build number: [run "ver" at a command prompt] 10.0.18362.267
Windows Terminal version (if applicable): v0.3.2142.0

Any other software? No

Steps to reproduce

Error 1: CMD

1. Open Windows Terminal
2. Open CMD tab
3. Close Terminal

Error 2: Ubuntu

1. Open Windows Terminal
2. Open Ubuntu tab
3. Input any command
4. Close Terminal

Actual behavior

Error 1: CMD

Error 2: Ubuntu

Terminal process remains on background and especially it occupies CPU resources excessively when after exiting terminal used as CMD.

When I use only PowerShell, terminal process disappears from background process list immediately after exiting terminal.

[dynalz]

Indeed this happens to me aswell.
Some scripts I have on python have been running on background without my knowledge after closing out Windows Terminal. I saw them accidentally because logs were being written and I happen to notice.

Quite easy to test running any background process that opens up a port (node API or frontend web dev), in my case, after closing windows terminal http://localhost:8080/ keeps being accessible due to process never shutting down

[DHowett-MSFT]

This looks like another shade of #2232.