deb2appimage won't build ScummVM AppImage on Xubuntu 22.04

I get this log:

Executing prerun...
Downloading dependencies...
Extracting dependencies...
Preparing AppImage AppDir...
Executing postrun...
Using 'appimagetool' to build AppImage for 'scummvm' to '/home/auster/Misc Programas/ScummVM/ScummVM.AppImage'...
appimagetool, continuous build (commit b719a7f), build <local dev build> built on 2022-09-29 13:55:16 UTC
Using architecture x86_64
/home/auster/.cache/deb2appimage/AppDir should be packaged as /home/auster/Misc Programas/ScummVM/ScummVM.AppImage/scummvm-2022-07-22-x86_64.AppImage
Deleting pre-existing .DirIcon
Creating .DirIcon symlink based on information from desktop file
AppStream upstream metadata found in usr/share/metainfo/scummvm.appdata.xml
Trying to validate AppStream information with the appstreamcli tool
In case of issues, please refer to https://github.com/ximion/appstream
scummvm.appdata.xml
  W: scummvm.desktop:4: cid-desktopapp-is-not-rdns scummvm.desktop
  W: scummvm.desktop:12: circular-component-relation

✘ Validation failed: warnings: 2, pedantic: 1
run_external: subprocess exited with status 3Failed to validate AppStream information with appstreamcli
Error Running appimagetool!
appimagetool failed to build scummvm
Exit code 6

This is the JSON code I am using:

{
   "buildinfo":[
      {
         "prerun":[
            "curl -sL https://downloads.scummvm.org/frs/scummvm/2.6.0/scummvm_2.6.0-1_ubuntu22.04_amd64.deb -o ~/.cache/deb2appimage/debs/scummvm.deb"
         ],
         "name":"scummvm",
         "version":"2022-07-22",
         "deps":"liba52-0.7.4,libasound2,libc6,libcurl3-gnutls,libfaad2,libflac8,libfluidsynth3,libfreetype6,libfribidi0,libgcc-s1,libgcc-s1,libgcc-s1,libgif7,libgl1,libglew2.2,libglib2.0-0,libgtk-3-0,libieee1284-3,libjpeg8,libmad0,libmpeg2-4,libogg0,libpng16-16,libsdl2-2.0-0,libsdl2-net-2.0-0,libsndio7.0,libspeechd2,libstdc++6,libtheora0,libvorbis0a,libvorbisfile3,scummvm-data,zlib1g,beneath-a-steel-sky,drascula,flight-of-the-amazon-queen,fluidsynth,lure-of-the-temptress",
         "repoarch":"amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,amd64,all,amd64,all,all,all,amd64,all",
         "distrorepo":"Ubuntu",
         "repoversion":"jammy",
         "binarypath":"/usr/games/scummvm",
         "desktoppath":"/usr/share/applications/scummvm.desktop",
         "iconpath":"/usr/share/icons/hicolor/scalable/apps/scummvm.svg",
         "usewrapper":"true",
         "postrun":[
            null
         ]
      }
   ],
   "apprunconf":[
      {
         "setpath":"true",
         "setlibpath":"true",
         "setpythonpath":"false",
         "setpythonhome":"false",
         "setpythondontwritebytecode":"false",
         "setxdgdatadirs":"false",
         "setperllib":"false",
         "setgsettingsschemadir":"false",
         "setqtpluginpath":"false",
         "exec":"/usr/games/scummvm"
      }
   ],
   "authors":[
      {
         "type":"Author",
         "author":"ScummVM",
         "url":"https://www.scummvm.org/"
      },
      {
         "type":"AppImage Maintainer",
         "author":"Auster"
      }
   ]
}

It sounds like the issue could be with AppStream, but I couldn't find anything about it on AppStream's page. And it also sounds like appimagetool may be related to the issue, but there's also issue #21 which makes it sound the problem could be on either the deb file or the deb2appimage tool itself. Due to all those observations, I'm not really sure what to do.

simoniz0r / deb2appimage

deb2appimage won't build ScummVM AppImage on Xubuntu 22.04 #22