Hi Wolfgang,

Many thanks for looking into this and for locating the problem.

This matches the behaviour I observed in the Syriac fallback tests: with |force=yes| the fallback vector was built correctly, whereas adding |check=yes| prevented the expected Syriac fallback from being used.

I will retest the original MWE once the correction to |font-col.lmt| is available in an updated ConTeXt distribution.

Best,
JP


Le 15/08/2026 à 12:53, Wolfgang Schuster a écrit :
Am 13.08.2026 um 09:51 schrieb Hans Hagen via ntg-context:
On 8/13/2026 9:15 AM, Jean-Pierre Delange via ntg-context wrote:
Hi Hans,

While testing Semitic languages for multilingual bibliography support
(in this case Aramaic/Syriac), I came across a reproducible problem with
`check=yes` in `\definefontfallback`.

hopefully Wolfgang can have a look at it as I'm in the middle of something else so switching to font mode ... otherwise it has to wait a couple of days.

I took a look at it and line 301 in font-col.lmt has to changed from

    elseif not newchars[target] then

to

    elseif not newchars[unic] then

Wolfgang 
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