https://bugzilla.redhat.com/show_bug.cgi?id=2009807
--- Comment #17 from Akira TAGOH tagoh@redhat.com --- Hm, that sounds like a flatpak runtime issue or flatpak app. flatpak is sharing fonts files on host but apparently there are no configuration provided by fonts packages which is important to decide the priority and then default fonts. The available font configuration files at flatpak app is something from packages only which flatpak runtime has.
Steps to confirm this: 1. run flatpak app: flatpak run org.gnome.gedit 2. enter the sandbox: flatpak enter org.gnome.gedit sh 3. try to run fc-match there: fc-match sans-serif:lang=am 4. also try to see if Noto Sans Ethiopic is available: fc-match "Noto Sans Ethiopic"
At step 3, fc-match returns FreeSerif which is available on flatpak app. At step 4, fc-match returns Noto Sans Ethiopic as requested which is available on host.