Devanagari counters in package expex examples with LuaLaTeX and babel

This question is an extension to this one. If I run the following code with LuaLaTeX, I do not get Devanagari numerals in the example's counter. Whereas I do get them with XeLaTeX.

\documentclass{article}\usepackage{iftex}\ifXeTeX\usepackage{polyglossia}\setdefaultlanguage{marathi}\setmainfont[Script=Devanagari,Mapping=devanagarinumerals]{Shobhika}\else\ifLuaTeX\usepackage{babel}\usepackage{fontspec}\babelprovide[mapdigits,maparabic]{marathi}\defaultfontfeatures{Renderer=Harfbuzz,Script=Devanagari}\babelfont{rm}{Shobhika}\fi\fi\usepackage{expex}\definelabeltype{devanagari}{labelgen=list,labellist={अ, आ, इ, ई, उ, ऊ, ए, ऐ, ओ, औ, अं, अः},    labelformat=A.,fullrefformat=XA,labelalign=left,labelwidth=.92em}\begin{document}    \lingset{labeltype=devanagari}    \pex    \a\begingl    \gla रामःआम्रफलम्खादति//    \glb रामआंबाखातो//    \glft रामआंबाखातो.//    \endgl    \a\begingl    \gla रामःआम्रफलम्खादति//    \glb रामआंबाखातो//    \glft रामआंबाखातो.//    \endgl    \xe\end{document}

XeLaTeX changes the numbering but LuaLaTeX doesn't. Why?

PS - Code can be run with both the compilers. When you change the compiler it requires a second run.