Chromium flatpak reliably crashes xdg-desktop-portal

For a while now I am facing the issue that Chromium installed via Flatpak after a minute or so stops working with a puzzling error ERR_NO_SUPPORTED_PROXIES. I guess this is due to the Proxy feature of the desktop portal because now I noticed that the portal is actually crashing shortly after I started Chromium and/or started browsing.

According to the stack trace this happens in get_one_app_state so I think this bug was fixed in version 1.7.0 with this patch: https://github.com/flatpak/xdg-desktop-portal/commit/a0b641f1230016e8ed9a291c70d4dd226429dda4

Could that fix please be backported to 1.6.0/focal?

           PID: 15467 (xdg-desktop-por)
           UID: 1000 (xxx)
           GID: 1000 (xxx)
        Signal: 11 (SEGV)
     Timestamp: Sat 2021-11-20 16:55:00 CET (4min 23s ago)
  Command Line: /usr/libexec/xdg-desktop-portal
    Executable: /usr/libexec/xdg-desktop-portal
 Control Group: /user.slice/user-1000.slice/user@1000.service/xdg-desktop-portal.service
          Unit: user@1000.service
     User Unit: xdg-desktop-portal.service
         Slice: user-1000.slice
     Owner UID: 1000 (xxx)
       Boot ID: 1841d625a5354885a778e18a20b48103
    Machine ID: 30e0f491ec7847428bc900251dc271af
      Hostname: xxx
       Storage: /var/lib/systemd/coredump/core.xdg-desktop-por.1000.1841d625a5354885a778e18a20b48103.15467.1637423700000000000000.lz4
       Message: Process 15467 (xdg-desktop-por) of user 1000 dumped core.

                Stack trace of thread 15505:
                #0 0x00007f5990c485f4 g_str_hash (libglib-2.0.so.0 + 0x405f4)
                #1 0x00007f5990c4773c g_hash_table_lookup (libglib-2.0.so.0 + 0x3f73c)
                #2 0x00005646137cf282 get_one_app_state (xdg-desktop-portal + 0x30282)
                #3 0x00005646137cf778 background_monitor (xdg-desktop-portal + 0x30778)
                #4 0x00007f5990c83ad1 n/a (libglib-2.0.so.0 + 0x7bad1)
                #5 0x00007f5990bee609 start_thread (libpthread.so.0 + 0x9609)
                #6 0x00007f5990b15293 __clone (libc.so.6 + 0x122293)

                Stack trace of thread 15470:
                #0 0x00007f5990b08aff __GI___poll (libc.so.6 + 0x115aff)
                #1 0x00007f5990c5a36e n/a (libglib-2.0.so.0 + 0x5236e)
                #2 0x00007f5990c5a4a3 g_main_context_iteration (libglib-2.0.so.0 + 0x524a3)
                #3 0x00007f5990c5a4f1 n/a (libglib-2.0.so.0 + 0x524f1)
                #4 0x00007f5990c83ad1 n/a (libglib-2.0.so.0 + 0x7bad1)
                #5 0x00007f5990bee609 start_thread (libpthread.so.0 + 0x9609)
                #6 0x00007f5990b15293 __clone (libc.so.6 + 0x122293)

                Stack trace of thread 15475:
                #0 0x00007f5990b08aff __GI___poll (libc.so.6 + 0x115aff)
                #1 0x00007f5990c5a36e n/a (libglib-2.0.so.0 + 0x5236e)
                #2 0x00007f5990c5a4a3 g_main_context_iteration (libglib-2.0.so.0 + 0x524a3)
                #3 0x00007f598e5f099d n/a (libdconfsettings.so + 0xa99d)
                #4 0x00007f5990c83ad1 n/a (libglib-2.0.so.0 + 0x7bad1)
                #5 0x00007f5990bee609 start_thread (libpthread.so.0 + 0x9609)
                #6 0x00007f5990b15293 __clone (libc.so.6 + 0x122293)

                Stack trace of thread 15467:
                #0 0x00007f5990b08aff __GI___poll (libc.so.6 + 0x115aff)
                #1 0x00007f5990c5a36e n/a (libglib-2.0.so.0 + 0x5236e)
                #2 0x00007f5990c5a6f3 g_main_loop_run (libglib-2.0.so.0 + 0x526f3)
                #3 0x00005646137bb7e8 main (xdg-desktop-portal + 0x1c7e8)
                #4 0x00007f5990a1a0b3 __libc_start_main (libc.so.6 + 0x270b3)
                #5 0x00005646137bb94e _start (xdg-desktop-portal + 0x1c94e)

                Stack trace of thread 15471:
                #0 0x00007f5990b08aff __GI___poll (libc.so.6 + 0x115aff)
                #1 0x00007f5990c5a36e n/a (libglib-2.0.so.0 + 0x5236e)
                #2 0x00007f5990c5a6f3 g_main_loop_run (libglib-2.0.so.0 + 0x526f3)
                #3 0x00007f5990eaff8a n/a (libgio-2.0.so.0 + 0x11ef8a)
                #4 0x00007f5990c83ad1 n/a (libglib-2.0.so.0 + 0x7bad1)
                #5 0x00007f5990bee609 start_thread (libpthread.so.0 + 0x9609)
                #6 0x00007f5990b15293 __clone (libc.so.6 + 0x122293)

xdg-desktop-portal:
  Installed: 1.6.0-1
  Candidate: 1.6.0-1
  Version table:
 *** 1.6.0-1 500
        500 http://de.archive.ubuntu.com/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status

Distributor ID: Neon
Description: KDE neon User - Plasma 25th Anniversary Edition
Release: 20.04
Codename: focal