Valve are preparing to ship the next version of Proton, their compatibility layer that runs Windows games on Steam Deck and Linux desktop with Proton 7.0-4 having a Release Candidate ready to test.

This only went up a few hours ago and you can try it and report feedback to Valve. As usual for testing releases, the current list of changes may be different to when it's out officially. To test it out you need to opt into the Beta on Proton 7 directly. So search for Proton 7 in your Steam Library, go into the Properties, Betas and select the "release-candidate".

If you wish to try it and give feedback, Valve are mainly interested in issues that are directly new in the release candidate builds. So if you find something is broken between Proton 7.0-3 and Proton 7.0-4, Valve need to know about it. A lot of the changes are coming over from previous builds of Proton Experimental.

You can report issues on the GitHub page.