Reading the repo I don't think it is. My issue persist on SteamOS and Nobara as well. Might be an incompatability with the Steam Deck and my adapter sadly
Been fighting sunshine to make either the rpm, flatpak or appimage work in gamemode. Kind of given up after a day of reading github issues and discord help posts to try and get them working. But I'm glad to see it's a bazzite feature that looks like it's being worked on for the future
atm both :39 and :latest are the same, but that changes on new fedora releases :39 will forever be based on fedora 39, while :latest will be based on whatever the latest stable fedora is