Can't toggle/preview/kill Livedown when using powershell as vim's shell

[xinoj]

Under Windows 10, and neovim 0.4.4, I can't send commands to livedown when shell is set to powershell in my vimrc.

If I remove the following lines from my vimrc, it defaults to using cmd.exe as shell, and livedown works fine:

set shell=powershell shellpipe=\| shellxquote=
set shellcmdflag=-NoLogo\ -NoProfile\ -ExecutionPolicy\ RemoteSigned\ -Command
set shellredir=\|\ Out-File\ -Encoding\ UTF8