Proton 8.0: No Man's Sky fails to launch with gamemode.

[FuzzyQuils]

Describe the bug No Man's Sky display's the Hello Games Logo then just closes. Using PROTON_LOG=1 reveals an assertion failure in winevulkan loader_thunks, as follows:

Assertion Failed: !status && "vkQueuePresentKHR", file ../src-wine/dlls/winevulkan/loader_thunks.c, line 5396

This disappears when run without gamemode.

To Reproduce

1. Launch No Man's Sky with gamemode using PROTON_LOG=1 gamemoderun %command in Steam Launch Options.
2. Witness crash.
3. Open steam-275850.log in home folder, the "Assertion failed" message will be present.
4. Launch this time without gamemode, the game runs correctly.

Expected behavior The game launches and can play with gamemode.

System Info:

• Arch Linux, Kernel 6.3.5 TkG with EEVDF+BORE patches.
• CPU: AMD Ryzen 7 3700X
• GPU: ASUS ROG Strix RX 5700XT
• GameMode Version: 1.7

Additional context I used to be able to play with gamemode without problems, making this a recent regression in either Proton or gamemode.