Cannot read property 'toLowerCase' of undefined

[Morgy93]

Hello,

sadly the extension doesn't work for me on remote ssh.
If I click on "Open in Windows Terminal" via explorer then the integrated terminal opens.
If I click on "Open in Windows Terminal (Profile)" and click one of the options (doesn't matter which), I'm left with:

Could not launch Windows Terminal:
Cannot read property 'toLowerCase' of undefined

I have no clue what's causing this, I'm on Windows with remote ssh on Linux.
Windows Terminal is installed via Microsoft Store and my settings.json reads:

"terminal.explorerKind": "external",
"terminal.external.windowsExec": "wt",

Any help?