I've been using Linux for over 14 years exclusively. Build several linux hosting companies. I know Linux rather well. I've built a simple font manager for gnome in the past. I know the weirdness of gnome font thingies.

I've had this glyph issue for over a year. In chromium, Signal, some ebook app, and several other snaps.

I've tried many things. But gave up. Snap is not 'one layer of indirection' too much. It's hundreds of them. There's chroot, some VM, a virtual gnome, containerisation, weird user and permissions. And so on.

This complexity made me conclude that snap is a bad solution (to a real problem). Not the glyph issue, but the fact that I cannot fix it, is, for me, the reason to conclude it has, or will fail.