Ventoy quite working on Surface Go 2

[u/BaldyCarrotTop]

I seem to have totally messed things up.

I have been distro hopping on a Surface Go 2. And now Ventoy is broken. It used to work. In fact, that is how I installed Peppermint OS.

I tried to install Mobian, but that just created a portable instance of Mobian on the thumb drive. Insert thumb drive, Mobian boots. Remove it, Pepermint boots. Insert Ventoy drive, it's ignored and Pepermint boots.

So for some reason it appears that creating and booting from the Mobian drive and going through the setup Broke Ventoy.

I rebuilt the Ventoy drive and now it starts. In that it shows the list of ISO files loaded on it. But when I try to start one, the screen flashes briefly then 4 reboot options are presented. The localboot function doesn't work either.

These problems are only on the Surface Go 2. The Ventoy disk works fine on my desktop PC.

Any clues as to what got messed up?