Glorious Eggroll has released another GE-Proton update with a tonne of fixes and a special note regarding Fall Guys.
For Fall Guys specifically:
When the Epic Online Services installer is running on a clean prefix, you must hit cancel on step 2/2, otherwise, Fall Guys will tell you the game is missing files and force you to exit.
Other changes in this update:
protonfixes: fix for Moero Chronicle (Thanks Kaedras and Snaggly)
protonfixes: fix for Shadows on the Vatican games (Thanks marianoag)
protonfixes: fix for The Blind Prophet (Thanks marianoag)
protonfixes: fix for Alter Ego (Thanks marianoag)
protonfixes: remove no longer needed fall guys easyanticheat_x64.so workaround (Thanks Corben)
added fix for Northstar launch argument not working (Thanks Jan ValveSoftware#6555)
added upstream proton script changes
added upstream font changes
added upstream openxr changes
added upstream steam helper fixes
added upstream user_settings changes
updated wine to latest bleeding edge
updated dxvk to latest git
updated vkd3d-proton to latest git
updated dxvk-nvapi to latest release
You can see the full changes for GE-Proton on their GitHub here