Hi, this is probably for Hans & Mikael, but maybe someone else has a hint:

If I set a fallback for my body font to catch all missing characters, 
some math accents get replaced by small bold uppercase characters (I 
found hat by K and ring by T so far).

I tried [fallbacks=] for math to no avail.

My example uses Cambria, but it’s the same with other fonts.

(BTW, in \bar{b} with Libertinus, the bar looks too high.)

Hraban


\definefontfallback[symbolaFB]
   [file:symbola.otf]
   [0x00000-0xFFFFF]
   [check=no,force=no]

\definefontfallback[arialFB]
   [name:arialunicodems]
   [0x00000-0xFFFFF]
   [check=no,force=no,rscale=0.85]

\starttypescript [contextstart]
   \definetypeface [contextstart] [rm] [serif] [cambria]
	[default][fallbacks=symbolaFB]
   \definetypeface [contextstart] [ss] [sans]  [segoe]
	[default][fallbacks=arialFB]
   \definetypeface [contextstart] [tt] [mono]  [modern]
	[default][fallbacks=arialFB]
   \definetypeface [contextstart] [mm] [math]  [cambria]
	[default]
\stoptypescript

\setupbodyfont[contextstart,12pt]

\starttext

\im{\hat{H} \widehat{HAT} \bar{b} \widebar{bar}}

\im{\mathring{+} \mathring{±} \mathring{x}}

\stoptext