Investigate: Ctrl-Space seems to work strangely for some folks

I'm using Git Bash (from Git 2.32.0.2) in Windows Terminal 1.9.1942.0 (installed via Windows Store), on Win10.

I connect to another machine via SSH and use screen there.
In screen I should be able to switch between the "windows" with `Ctrl-A Space`.

Right now this only works if I don't press Ctrl anymore when pressing Space - I'm pretty sure it wasn't like this before, and it definitely isn't like that with the (Putty-based, AFAIK?) **mintty** Terminal emulator that comes with Git for Windows (or any terminal emulator I tried on Linux).
So `Ctrl-A` *release keys* `Space` works, `Ctrl-A-` *keep pressing those keys* `Space` does not work (when using Windows Terminal), even though it should (and after almost 20 years of doing this I don't think I can retrain my muscle memory).

**UPDATE:** When I connect to a Linux machine per SSH and run `cat -v` and then press `Ctrl-Space`, it prints `^@` with mintty (from git) and nothing at all with Windows Terminal.

_Originally posted by @DanielGibson in https://github.com/microsoft/terminal/issues/2865#issuecomment-914471061_

Reproduce the report in Windows Terminal 1.9.1942.0 with Git Bash, an SSH connection, and screen, comparing held-key Ctrl-A Space with released keys. Run cat -v on the remote Linux machine and compare the Ctrl-Space output with mintty; done when the differing input behavior is understood and corrected or documented.

Written by the indexing model from the issue text.