[NTG-context] vanishing leftarrow

[Hans van der Meer]

I did encounter something strange with leftarrow in metapost math:

In normal text:
All three arrows appear with $l\leftarrow r\rightarrow lr\leftrightarrow$.

In metapost:
The leftarrow does not appear, the others do in:
\placefigure{}{\startMPgraphic
u = 180mm; v = 40mm;
label.bot(textext("$l\leftarrow r\rightarrow lr\leftrightarrow$"),(u/2,v));
\stopMPgraphic\loadcurrentMPgraphic{}\placeMPgraphic}

How is that possible and how can it be repaired?

Hans van der Meer

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