From microsoft/terminal#9577

Here:
docs.microsoft.com/en-us/windows/terminal/customize-settings/actions
I read

**Duplicate tab**
This makes a copy of the current tab and opens it.

but what is copied ? What is the difference with a "New tab" ?
I mean: not what was printed previously in cmd.exe for example.

And, for cmd.exe, modified/added ENV VARIABLES are not "copied" =)