Happened after an update yesterday. The font was installed only in the system, not in user ~/.fonts. It has ligatures, and it is enabled in settings.json.
Before an update, system fonts were working in a Flatpak. With ligatures and everything.
Now even when I try adding an override for filesystem to /usr/share/fonts:ro or /run/host/fonts:ro, the app refuses to open because it freezes on startup.
Do you know why that could've happened?