SUMMARY
Since a couple of days audiotube stopped reproducing songs that was playing nicely before. I'm using the flatpak version.

STEPS TO REPRODUCE
1. try to reproduce for example: https://music.youtube.com/watch?v=ctPqjx__yuA

OBSERVED RESULT
song graphics and even lyrics are shown. no music is played. "play" and "next" buttons can be clicked, but do nothing

EXPECTED RESULT
to hear the music 

SOFTWARE/OS VERSIONS
AudioTube: 25.08.2
KDE Flatpak runtime (Wayland)
ytmusicapi: 1.11.1
KDE Frameworks: 6.19.0
Qt: Using 6.9.3 and built against 6.9.3
Flatpak
Build ABI: x86_64-little_endian-lp64
Kernel: linux 6.6.107-1-MANJARO

ADDITIONAL INFORMATION
If I run from shell prompt as in 
#flatpak run --branch=stable --arch=x86_64 --command=audiotube org.kde.audiotube
I get in stdout:
futuresql: Migrations finished
futuresql: Running "select distinct (search_query) from searches order by search_id desc limit 20"
futuresql: Running "select * from favourites natural join songs order by favourites.rowid desc"
futuresql: Running "select * from played_songs natural join songs order by played_songs.rowid desc"
futuresql: Running "select * from played_songs natural join songs order by plays desc limit 10"
futuresql: Running "select * from playlists"
qt.qml.invalidOverride: qrc:/qt/qml/org/kde/audiotube/contents/ui/AlbumCoverItem.qml:19:12: Duplicate signal name: invalid override of property change signal or superclass signal
futuresql: Running "select * from playlists"
futuresql: Running "select * from playlists"
futuresql: Running "select video_id from playlist_entries where playlist_id = ? order by random() limit 4"
futuresql: Running "select video_id from playlist_entries where playlist_id = ? order by random() limit 4"
futuresql: Running "select video_id from playlist_entries where playlist_id = ? order by random() limit 4"
futuresql: Running "select * from playlists"
futuresql: Running "select video_id from playlist_entries where playlist_id = ? order by random() limit 4"
qt.multimedia.gstreamer: Using Qt multimedia with GStreamer version: "GStreamer 1.24.12"
No formats found
futuresql: Running "select count(*) > 0 from favourites where video_id = ?"
[youtube] Extracting URL: ctPqjx__yuA
[youtube] ctPqjx__yuA: Downloading webpage
[youtube] ctPqjx__yuA: Downloading tv client config
[youtube] ctPqjx__yuA: Downloading tv player API JSON
[youtube] ctPqjx__yuA: Downloading web safari player API JSON
[youtube] ctPqjx__yuA: Downloading m3u8 information
futuresql: Running "insert or replace into songs (video_id, title, artist, album) values (?, ?, ?, ?)"
futuresql: Running "insert or ignore into played_songs (video_id, plays) values (?, ?)"
futuresql: Running "update played_songs set plays = plays + 1 where video_id = ? "
futuresql: Running "select * from played_songs natural join songs order by played_songs.rowid desc"
futuresql: Running "select * from played_songs natural join songs order by plays desc limit 10"