what is going on with the placement of the dot in this example, and how can I avoid it?

\starttext
\startTEXpage[offset=3bp]
$E_tE_s=E_{\min(t,s)}$.

\switchtobodyfont[stixtwo]$E_tE_s=E_{\min(t,s)}$.

\switchtobodyfont[lucidaot]$E_tE_s=E_{\min(t,s)}$.
\stopTEXpage
\stoptext

Output attached.

/Mikael