Controller issue with Volume (365770)

Compatibility Report

• Name of the game with compatibility issues: Volume
• Steam AppID of the game: 365770

System Information

• GPU: GTX 960
• Driver/LLVM version: nvidia 396-54.1
• Kernel version: 4.18
• Link to full system information report as Gist: My infos
• Proton version: 3.16-4

I confirm:

• that I haven't found an existing compatibility report for this game.
• that I have checked whether there are updates for my system available.

Symptoms

When I try to play the game with a controller (360 or PS3), it's like if the stick was stuck in a direction. Usually bottom-right. Sometimes it seems to change but it's hard to notice a real relation between the direction pressed on the stick and the direction of the character.

I've got the same problem with Superflight (732430) but I've tried tens of games on Proton or native linux games with my controllers with no problems.

I thought that it may be a Unity related problem, but Volume does not seem to use Unity.

Reproduction

Just try to play the game with a joystick.

No source file, test, or entry point is identified in the report. Start by reproducing the controller behavior in Volume with Proton 3.16-4 and the listed system configuration; done means the stick input is interpreted correctly rather than remaining stuck in a direction.