File Picker not working when application Installed on Linux

[simon52656]

When I just publish my avalonia UI application and run the app from desktop on linux the file picker work as expected,

When I package the application into a .deb package as documented here the file picker dosn't work after it's been installed

App installation Location: /opt/
Using Avalonia 11.2.0 release and dotnet 8.0

Error when file picker is opened:
Tmds.DBus.Protocol.DBusException: org.freedesktop.DBus.Error.AccessDenied: Portal operation not allowed: Unable to open /proc/3799/root
at Tmds.DBus.Protocol.DBusConnection.MyValueTaskSource1.System.Threading.Tasks.Sources.IValueTaskSource<T>.GetResult(Int16 token) at Tmds.DBus.Protocol.DBusConnection.CallMethodAsync[T](MessageBuffer message, MessageValueReader1 valueReader, Object state)
at Tmds.DBus.Protocol.Connection.CallMethodAsync[T](MessageBuffer message, MessageValueReader`1 reader, Object readerState)
at Avalonia.FreeDesktop.DBusSystemDialog.OpenFilePickerAsync(FilePickerOpenOptions options)
at Avalonia.Platform.Storage.FallbackStorageProvider.OpenFilePickerAsync(FilePickerOpenOptions options)

Any idea what's happening?

Thanks