KeepassXC attempts to use a privileged file when using portals and can't open a File Chooser

[txtsd]

Operating System

Arch Linux

XDG Desktop Portal version

1.18

XDG Desktop Portal version (Other)

No response

Desktop Environment

wlroots

Desktop Environment (Other)

Sway

Expected Behavior

KeepassXC should open a File Chooser

Current Behavior

KeepassXC does nothing

Steps to Reproduce

1. Create a file ~/.config/xdg-desktop-portal/portals.conf
2. Fill it with

[preferred]
default=wlr;gtk
org.freedesktop.impl.portal.FileChooser=lxqt

3. Install xdg-desktop-portal-wlr andxdg-desktop-portal-gtk and xdg-desktop-portal-lxqt and pcmanfm-qt if not already installed
4. Log out and log back in
5. Run KeepassXC and hit the Open Database button.
6. Nothing happens
   ...

Anything else we should know?

Here's a dbus-monitor log:

method call time=1730043932.721391 sender=:1.65 -> destination=org.freedesktop.portal.Desktop serial=84 path=/org/freedesktop/portal/desktop; interface=org.freedesktop.portal.FileChooser; member=OpenFile
   string "x11:1"
   string "Open database"
   array [
      dict entry(
         string "directory"
         variant             boolean false
      )
      dict entry(
         string "filters"
         variant             array [
               struct {
                  string "KeePass 2 Database "
                  array [
                     struct {
                        uint32 0
                        string "*.kdbx"
                     }
                  ]
               }
               struct {
                  string "All files "
                  array [
                     struct {
                        uint32 0
                        string "*"
                     }
                  ]
               }
            ]
      )
      dict entry(
         string "handle_token"
         variant             string "qt2944820299"
      )
      dict entry(
         string "modal"
         variant             boolean true
      )
      dict entry(
         string "multiple"
         variant             boolean false
      )
   ]
method call time=1730043932.721809 sender=:1.28 -> destination=org.freedesktop.DBus serial=108 path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; member=GetConnectionUnixProcessID
   string ":1.65"
method return time=1730043932.721820 sender=org.freedesktop.DBus -> destination=:1.28 serial=4294967295 reply_serial=108
   uint32 2504
error time=1730043932.722082 sender=:1.28 -> destination=:1.65 error_name=org.freedesktop.DBus.Error.AccessDenied reply_serial=84
   string "Portal operation not allowed: Unable to open /proc/2504/root"

KeepassXC functions correctly without the mentioned portals.conf file when it does not use portals to open the File Chooser.

Upstream won't do anything about it citing a problem with my environment instead.
See old issue: keepassxreboot/keepassxc#7607
See relevant snapcraft thread: https://forum.snapcraft.io/t/file-chooser-doesnt-show-using-kde-neon-extension/29244/21
See Arch issue where it was decided it's not a packaging issue: https://gitlab.archlinux.org/archlinux/packaging/packages/keepassxc/-/issues/8