On Windows, when the Latvian language is selected for the keyboard layout, AltGr triggers the Ctrl+Alt key sequence. This was reported in https://github.com/canonical/multipass/issues/3300 and I was able to reproduce (on Windows 10).
Nevermind, Ctrl+Alt is a valid way to add a bar (macron?) on top of letters (e.g. ū) with the Latvian keyboard. We're using the NativeText representation so both sequences amount to the same thing.
On Windows, when the Latvian language is selected for the keyboard layout, AltGr triggers the Ctrl+Alt key sequence. This was reported in https://github.com/canonical/multipass/issues/3300 and I was able to reproduce (on Windows 10).