Valve's Proton changelog lists 18 fixes for Proton 11 regressions in Proton Experimental, on a page last edited October 2, and the 11.0-2 section of the same page carries none of them. Experimental is Valve’s rolling test branch of Proton, so as the page stands these fixes reach a game only through Experimental.
Valve has also shipped Proton 11.0-2e, released on October 9 and described in its notes as "a small update for Proton 11.0-2". It lists two fixes: the EA App launcher's login window not being focused properly with Gamescope, and EA App titles not showing the correct splash image. Both appear word for word in Experimental's list, so those two have now reached stable, and the 11.0-2e notes list nothing else.
Deus Ex: Mankind Divided on AMD GPUs and Lords of The Fallen are among the games the list brings back
Valve writes that Deus Ex: Mankind Divided "should be playable again with AMD GPUs", and calls Lords of The Fallen, Lunacid: Tears of the Moon, Ligo and the Surviving Deponia Playtest playable again. Locoland's videos and the Grand Theft Auto III intro videos play again.
Several of the remaining entries are about how a game sits on the desktop. By a count of the entries, five of the 18 are fullscreen or focus problems. FLY'N now starts in fullscreen, Mugsters no longer shows the taskbar over the game with certain window managers, Warhammer: Vermintide 2 no longer shows its title bar in fullscreen with those window managers, Guild Wars 2 no longer shows KDE's taskbar in fullscreen, and Far Cry no longer becomes impossible to interact with after switching to another application and back on SteamOS. Several entries use "should", so they describe what Valve expects rather than a per-game test result.
The same section also fixes Crysis on newer AMD CPUs and adds early 32-bit OpenXR support
The same section says Crysis and Crysis Wars were not playable "with some newer AMD CPUs that support CPUID faulting", and that this is fixed. It does not name the processors. It also fixes Blue Effect VR not starting on some CPUs and adds early support for 32-bit OpenXR, which "requires PROTON_USE_WOW64=1 on x86".
On the graphics side, Far Cry 5 and Far Cry New Dawn no longer show an old-driver or GPU warning on AMD GPUs, and HDR in Far Cry 5 is fixed.
Experimental also tracks development code. The section updates vkd3d-proton, DXVK, vkd3d, dxvk-nvapi and FEX to their latest development versions, and among its own fixes it lists a Proton Experimental regression that made CEG-protected games unplayable.