Text in plug mode (Harfbuzz) does not work inside \text/\mtext

Hi! Currently, when font-plugins is used along with Harfbuzz, fonts and
font fallbacks using Harfbuzz features don't work with \text nor \mtext.
Strangely enough, the good ol' \hbox workaround does. MWE attached.

Regards,

Jairo

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\usemodule[fonts-plugins]

\definefontfeature[harf]
  [mode=plug,
   features=harfbuzz,
   shaper=native,
   script=khmr]

\definefallbackfamily[mainface][rm][battambang]
  [range=khmer,
   force=yes,
   features=harf]

\definefontfamily[mainface][rm][dejavuserif]
\setupbodyfont[mainface]

\starttext

អក្សរខ្មែរ

\startformula 

\hbox{អក្សរខ្មែរ}
% \text{អក្សរខ្មែរ} = 1 + 1
% \mtext{អក្សរខ្មែរ} = 1 + 1

\stopformula

\stoptext