Missing libFLAC.so.8 when trying to run ScummVM games

[terzag]

When I try to run ScummVM games, I get the following error in the log:

Started initial process 1006 from gamemoderun /home/terzag/.var/app/net.lutris.Lutris/data/lutris/runners/scummvm/bin/scummvm --extrapath=/home/terzag/.var/app/net.lutris.Lutris/data/lutris/runners/scummvm/share/scummvm --themepath=/home/terzag/.var/app/net.lutris.Lutris/data/lutris/runners/scummvm/share/scummvm --aspect-ratio --fullscreen --scaler=normal --scale-factor=3 --path=/mnt/data2/Jeux/dreamweb dreamweb
Start monitoring process.
/home/terzag/.var/app/net.lutris.Lutris/data/lutris/runners/scummvm/bin/scummvm: error while loading shared libraries: libFLAC.so.8: cannot open shared object file: No such file or directory
Monitored process exited.
Initial process has exited (return code: 32512)
All processes have quit
Exit with return code 32512

I've tried with DreamWeb and Beneath a Steel Sky, which are both freely downloadable from the ScummVM website. It seems to happen with games that don't have FLAC files too (BaSS doesn't).

Using Xubuntu 23.10 which only has libFLAC.so.12 in its repos, if that matters for flatpak apps. But I would assume that the issue comes from a missing library/version from the flatpak runtimes and apps only use libs from them?

Lutris is up to date (0.5.17).
flatpak 1.14.4
flatpak --gl-drivers mentions "default" and "host".

I had originally submitted a bug report for the Lutris client, not sure which one is the proper repo for this: lutris/lutris#5236