Control (2019) fails to launch under Proton

**Game information**

Control (2019)

**Distribution name and version where applicable**

Fedora 32 Silverblue

**Flatpak info**

```
$ flatpak --version
Flatpak 1.5.0
$ flatpak --gl-drivers
default
host
```

**Problem description**

Control (2019) running under the latest proton runs fine if I directly launch the executable on my host with Proton like so:

```
env STEAM_COMPAT_DATA_PATH=~/.var/app/com.valvesoftware.Steam/.local/share/Steam/steamapps/compatdata/3782636396/ '../../../../../../common/Proton 4.11/proton' run 'Control_DX11.exe'
```
Running the exact same command under a `flatpak run --command=/bin/bash 'com.valvesoftware.Steam'` shell fails with essentially no logs or debugging info.

```
[📦 com.valvesoftware.Steam Control]$ env PROTON_LOG=1 STEAM_COMPAT_DATA_PATH=~/.var/app/com.valvesoftware.Steam/.local/share/Steam/steamapps/compatdata/3782636396/ '../../../../../../common/Proton 4.11/proton' run Control_DX11.exe
Proton: Missing or invalid openvrpaths.vrpath file! [Errno 2] No such file or directory: '/var/home/plailect/.var/app/com.valvesoftware.Steam/config/openvr/openvrpaths.vrpath'
esync: up and running.
```

No proton logs are produced (either stdout or in my home folder as the internet may suggest), and the openvrpaths error seems to appear for every game I run under proton (and also appears when the game is working on the host), so it is likely unrelated.

**Does this issue reproduce with native Steam**

No.