ultrawide command no longer working on steam deck

[veryrealwildcat]

using the latest version, the ultrawide command and setting the in game resolution to 1280x800 just seems to internally use 1152x720
pretty sure this is some weird base game problem and er-patcher's border removal is broken outright.
I'm on the latest version of elden ring, proton experimental and the preview channel on the steam deck, since a fix for elden ring was added in 3.6.6
The other features like the fps unlocker and skip intro are working perfectly so i know that er-patcher is working in general.

[ja14000]

How are you determining the internal resolution?

[veryrealwildcat]

How are you determining the internal resolution?

by eye. both look identical in how much screen real estate they take up, or by how stretched it is.

[Foxlass]

Can confirm that it doesn't work for me either