Does not start due to symbolic link error (bwrap)

Bubblewrap gives me a very strange error when trying to start Steam (fresh installation):

## STR

```
$ flatpak run com.valvesoftware.Steam
bwrap: Can't make symlink at /var/home/rugk/Musik: File exists
```

## Expected

I have no idea why it even mangles with my home folders, what does it have to do with that? After aall, it should not even have access to any files (yet, in $HOME), which is a good thing IMHO:
**Edit:** Ah no, wtf – why does it have/need to have access to pictures and music?

```
$ flatpak info --show-permissions com.valvesoftware.Steam
[Context]
shared=network;ipc;
sockets=x11;wayland;pulseaudio;
devices=all;
features=devel;multiarch;bluetooth;per-app-dev-shm;
filesystems=xdg-run/app/com.discordapp.Discord:create;xdg-pictures:ro;xdg-music:ro;
persistent=.;
unset-environment=ALSA_CONFIG_PATH;TZ;STEAM_RUNTIME_PREFER_HOST_LIBRARIES;STEAM_RUNTIME;SDL_VIDEODRIVER;MESA_GLSL_CACHE_DIR;

[Session Bus Policy]
org.kde.StatusNotifierWatcher=talk
org.freedesktop.Notifications=talk
org.gnome.SettingsDaemon.MediaKeys=talk
org.freedesktop.ScreenSaver=talk
org.freedesktop.PowerManagement=talk

[System Bus Policy]
org.freedesktop.NetworkManager=talk
org.freedesktop.UPower=talk
org.freedesktop.UDisks2=talk

[Environment]
ALSA_CONFIG_PATH=
TZ=
STEAM_EXTRA_COMPAT_TOOLS_PATHS=/app/share/steam/compatibilitytools.d
PYTHONPATH=/app/utils/lib/python3.8/site-packages
LC_NUMERIC=C
FLATPAK_PREFER_USER_NPM=1
LC_MONETARY=C
FLATPAK_STEAM_UPDATE_SYMLINKS=0
DBUS_FATAL_WARNINGS=0
STEAM_RUNTIME_PREFER_HOST_LIBRARIES=
FLATPAK_STEAM_XDG_DIRS_PREFIX=~/.var/app/com.valvesoftware.Steam
LC_TELEPHONE=C
SSL_CERT_DIR=/etc/ssl/certs
STEAM_RUNTIME=
LC_MEASUREMENT=C
XDG_DATA_DIRS=/app/share:/usr/lib/extensions/vulkan/share:/usr/share:/usr/share/runtime/share:/run/host/user-share:/run/host/share
LC_NAME=C
XDG_CONFIG_DIRS=/etc/xdg:/usr/lib/x86_64-linux-gnu/GL:/usr/lib/i386-linux-gnu/GL
LC_COLLATE=C
SDL_VIDEODRIVER=
GST_PLUGIN_SYSTEM_PATH=/app/lib/gstreamer-1.0:/app/lib32/gstreamer-1.0:/usr/lib/extensions/gstreamer-1.0:/usr/lib/x86_64-linux-gnu/gstreamer-1.0:/usr/lib/i386-linux-gnu/gstreamer-1.0
MESA_GLSL_CACHE_DIR=
LC_ADDRESS=C
PATH=/app/bin:/app/utils/bin:/usr/bin
PROTON_DEBUG_DIR=/var/tmp
```

The thing is, I already have a symbolic link there (deliberately done because that's how I sync my music via Nextcloud), so it likely fails because of that:
```
$ ls -la /var/home/rugk/Musik
lrwxrwxrwx. 1 rugk rugk 16 5. Jun 2020 /var/home/rugk/Musik -> Nextcloud/Musik/
```

## Flatpaks

```
$ flatpak info com.valvesoftware.Steam

Steam - Launcher for the Steam software distribution service

Kennung: com.valvesoftware.Steam
Ref: app/com.valvesoftware.Steam/x86_64/stable
Architektur: x86_64
Zweig: stable
Version: 1.0.0.74
License: LicenseRef-proprietary
Ursprung: flathub
Sammlung: org.flathub.Stable
Installation: system
Installiert: 41,7 MB
Laufzeitumgebung: org.freedesktop.Platform/x86_64/21.08
Sdk: org.freedesktop.Sdk/x86_64/21.08

Commit: 8bb8984c379ba159da39079071fde6a0f87e2e40b45a46ff8e77e7f0bf1bd99c
Parent: 4a606a219c4745d5ce93b290e54395be9031bd39f347d7f73257566abf568085
Subject: wrapper: Run Steam with -no-cef-sandbox (93f2ab02)
Date: 2022-02-18 19:38:24 +0000

$ flatpak info com.valvesoftware.Steam.CompatibilityTool.Proton

Proton (community build) - Die neueste Proton-Version basiert auf dem Flatpak
Freedesktop SDK

Kennung: com.valvesoftware.Steam.CompatibilityTool.Proton
Ref: runtime/com.valvesoftware.Steam.CompatibilityTool.Proton/x86_64/stable
Architektur: x86_64
Zweig: stable
Version: 6.3-8
License: BSD-3-Clause and LGPL-2.1 and zlib-acknowledgement and Zlib and OFL-1.1 and MIT and MPL-2.0 and LicenseRef-proprietary
Ursprung: flathub
Sammlung: org.flathub.Stable
Installation: system
Installiert: 1,3 GB

Commit: 178156a2fa0176c213863f25516ef4b5c975f8440c5a1b0ff2a80d596729a61b
Parent: 45e44547ce7633ef3f0c5e6539081c97d92241fa86dacb9b14141c1c99291e9c
Subject: Remove rc version from metainfo (c45779a9)
Date: 2022-01-01 20:37:47 +0000
```

## System

Flatpak v1.12.7
Fedora 35 Silverblue (35.20220329.0)

## Solution

Remove access to pictures and music?