flatpak fonts are being screwy.
Some more discussion and options discussed on Encoding Issue in Bluefin - #17 by wuarmin
but plyply’s solution worked for me
flatpak list --app --columns=application,runtime|grep org.gnome.Platform|awk -F '\t' '{print "flatpak run --command=fc-cache " $1 " -f -v"}'|xargs -I % echo "%"|sh