Dialog boxes with unreadable text display issue

[Ian2020]

On snap app v5.3.6 when I bring up any file dialogs (e.g. save backup or select firmware) I see text as boxes:

This seems to be a known issue elsewhere (upstream?) electron-userland/electron-builder#5217 - it has been closed by a bot however one person is questioning that. The suggested workaround:

sudo rm /var/cache/fontconfig/*
rm ~/.cache/fontconfig/*
fc-cache -r

...is not working for me either unfortunately.

[Ian2020]

Ok after digging through the workaround chat at https://forum.snapcraft.io/t/snapped-app-not-loading-fonts-on-fedora-and-arch/12484/48 this worked around it on Fedora 34:

rm ~/.cache/fontconfig/* ~/snap/onlykey-app/common/.cache/fontconfig/*