3 errors upon starting Steam. Also can't play Asphalt 9 Legends. How to fix?

When I run `flatpak run com.valvesoftware.Steam`, I found 3 groups of error when steam start (not play any game yet). These are:

```
Gtk-Message: 01:14:16.515: Failed to load module "canberra-gtk-module"
```

```
boxtron: error: Game not recognized as DOSBox compatible.
boxtron: error: DOSBox argument error: "unrecognized arguments: -d3d12"
```

```
ProtonFixes[573] WARN: [CONFIG]: Parent directory "/home/user/.config/protonfixes" does not exist. Abort.
ProtonFixes[573] WARN: Skipping fix execution. We are probably running an unit test.
```

To solve the ProtonFixes issue, I even did:

`lrwxrwxrwx 1 user user 112 Aug 16 14:19 protonfixes -> /home/user/.var/app/com.valvesoftware.Steam/.local/share/Steam/compatibilitytools.d/GE-Proton10-12/protonfixes`

but the warning still appears.

Theses are extracted from below:

```
Exit code: 0
Saving response to: /tmp/steambhJkIp - 262 bytes
steamwebhelper.sh[132]: Starting steamwebhelper under bootstrap steamrt steam runtime via: /home/user/.var/app/com.valvesoftware.Steam/.local/share/Steam/steamrt64/steam-runtime-steamrt/_v2-entry-point
steamwebhelper.sh[132]: CEF sandbox already disabled
steamwebhelper.sh[132]: Starting steamwebhelper with steamrt steam runtime at /home/user/.var/app/com.valvesoftware.Steam/.local/share/Steam/steamrt64/steam-runtime-steamrt/_v2-entry-point
Steam Runtime Launch Service: starting steam-runtime-launcher-service
Steam Runtime Launch Service: steam-runtime-launcher-service is running pid 226
bus_name=com.steampowered.PressureVessel.LaunchAlongsideSteam
exec ./steamwebhelper -nocrashdialog -lang=en_US -cachedir=/home/user/.var/app/com.valvesoftware.Steam/.local/share/Steam/config/htmlcache -steampid=100 -buildid=1751405894 -steamid=0 -logdir=/home/user/.var/app/com.valvesoftware.Steam/.local/share/Steam/logs -uimode=7 -startcount=0 -steamuniverse=Public -realm=Global -clientui=/home/user/.var/app/com.valvesoftware.Steam/.local/share/Steam/clientui -steampath=/home/user/.var/app/com.valvesoftware.Steam/.local/share/Steam/ubuntu12_32/steam -launcher=0 --valve-initial-threadpool-size=8 --valve-enable-site-isolation --enable-smooth-scrolling --no-sandbox --password-store=basic --log-file=/home/user/.var/app/com.valvesoftware.Steam/.local/share/Steam/logs/cef_log.txt --disable-quick-menu --disable-component-update --enable-features=PlatformHEVCDecoderSupport --disable-features=SpareRendererForSitePerProcess,DcheckIsFatal,BlockPromptsIfIgnoredOften,ValveFFmpegAllowLowDelayHEVC
reaping pid: 101 -- steam
Desktop state changed: desktop: { pos: 0, 0 size: 3840,1080 } primary: { pos: 1920, 0 size: 1920,1080 }
Caching cursor image for , size 1x1, serial 499, cache size = 0
sh: line 1: lsb_release: command not found
ProtonFixes[573] WARN: [CONFIG]: Parent directory "/home/user/.config/protonfixes" does not exist. Abort.
ProtonFixes[573] WARN: Skipping fix execution. We are probably running an unit test.
fsync: up and running.
Fossilize INFO: Overriding serialization path: "/home/user/.var/app/com.valvesoftware.Steam/.local/share/Steam/shader_cache_temp_dir_d3d11_64/fozpipelinesv6/steamapprun_pipeline_cache".
ProtonFixes[889] WARN: [CONFIG]: Parent directory "/home/user/.config/protonfixes" does not exist. Abort.
ProtonFixes[889] WARN: Skipping fix execution. We are probably running an unit test.
fsync: up and running.
Fossilize INFO: Overriding serialization path: "/home/user/.var/app/com.valvesoftware.Steam/.local/share/Steam/shader_cache_temp_dir_d3d12_64/fozpipelinesv6/steamapprun_pipeline_cache".
boxtron: adding /app/share/steam/compatibilitytools.d/Boxtron/share/boxtron/bin to PATH
boxtron: adding /app/share/steam/compatibilitytools.d/Boxtron/share/boxtron/lib to LD_LIBRARY_PATH
boxtron: working dir: "/home/user/.var/app/com.valvesoftware.Steam/.local/share/Steam"
boxtron: original command: ['/home/user/.var/app/com.valvesoftware.Steam/.local/share/Steam/ubuntu12_32/../bin/d3ddriverquery64.exe']
boxtron: screen '0': 1920x1080
boxtron: screen '1': 1920x1080
boxtron: selected screen '0'
boxtron: looking for sf2 file: /app/share/steam/compatibilitytools.d/Boxtron/share/boxtron/share/sounds/sf2/FluidR3_GM.sf2
boxtron: found soundfont: /app/share/steam/compatibilitytools.d/Boxtron/share/boxtron/share/sounds/sf2/FluidR3_GM.sf2
boxtron: ignoring command: ['/home/user/.var/app/com.valvesoftware.Steam/.local/share/Steam/ubuntu12_32/../bin/d3ddriverquery64.exe']
boxtron: error: Game not recognized as DOSBox compatible.
Gtk-Message: 01:14:12.195: Failed to load module "canberra-gtk-module"
Gtk-Message: 01:14:12.195: Failed to load module "canberra-gtk-module"
boxtron: adding /app/share/steam/compatibilitytools.d/Boxtron/share/boxtron/bin to PATH
boxtron: adding /app/share/steam/compatibilitytools.d/Boxtron/share/boxtron/lib to LD_LIBRARY_PATH
boxtron: working dir: "/home/user/.var/app/com.valvesoftware.Steam/.local/share/Steam"
boxtron: original command: ['/home/user/.var/app/com.valvesoftware.Steam/.local/share/Steam/ubuntu12_32/../bin/d3ddriverquery64.exe', '-d3d12']
boxtron: screen '0': 1920x1080
boxtron: screen '1': 1920x1080
boxtron: selected screen '0'
boxtron: looking for sf2 file: /app/share/steam/compatibilitytools.d/Boxtron/share/boxtron/share/sounds/sf2/FluidR3_GM.sf2
boxtron: found soundfont: /app/share/steam/compatibilitytools.d/Boxtron/share/boxtron/share/sounds/sf2/FluidR3_GM.sf2
boxtron: error: DOSBox argument error: "unrecognized arguments: -d3d12"
Gtk-Message: 01:14:16.515: Failed to load module "canberra-gtk-module"
Gtk-Message: 01:14:16.515: Failed to load module "canberra-gtk-module"
```