Valve has released the new version 5.0-8 of Proton:

5.0-8:

Dramatically improve loading times for Streets of Rage 4.
Fix crashes in Detroit: Become Human, Planet Zoo, Jurassic World: Evolution, Unity of Command II, and Splinter Cell Blacklist.
Performance improvements for DOOM Eternal, Detroit: Become Human, and We Happy Few.
Support latest Steam SDKs, which fixes games such as Scrap Mechanic, and Mod and Play.
Fix some Rockstar Launcher errors on some systems.
Update DXVK to v1.7.
Update FAudio to 20.06.
Pull in latest vkd3d work.
On KDE, games being fullscreen should no longer prevent alt-tabbing out of the game.
Fix crash on launch in STEINS;GATE 0.
Fix missing network ping times in some multiplayer games like Path of Exile and Wolcen.
Fix external links in Lords Mobile.
Fix crash on launch in TOXIKK.
Improve gstreamer performance.
Fix WRC 7 crash when using a steering wheel controller. Note that some force-feedback effects may require a kernel >= 5.7.