https://forums.garmin.com/developer/connect-iq/f/discussion/2008/does-the-symbol-work/13353#13353
I found the degree symbol doesn't work on some devices like fenix6 when the system language is Chinese.
IIRC, the symbol exists in a number font. But it is really not convenient to use more than one font to print a text string.
Is there any workaroud except custom fonts