Control-Alt-z is sending the code for Control-z

[amareshjoshi]

when i type (in emacs) control-alt-z (C-M-z) the terminal interprets it as control-z.

i can type other C-M combos. for eaxmple C-M-f is different from C-f.
but it doesn't work for C-M-z. i can get the right behavior using:
ESC (and release) and then pressing C-z

curiously it does work properly in the regular wsl.exe application.