bizarre bug in xml

["Thomas A. Schmitz" <thomas.schmitz@uni-bonn.de>]

Hi all,

this is the most bizarre bug I've ever seen in context. I would be 
grateful if others could try to replicate it. Test file:

\startbuffer[test]
<document>
     <hskip width="1em"/>Materiam vati da Venus alma tuo.
</document>
\stopbuffer

\startxmlsetups xml:testsetups
         \xmlsetsetup{#1}{*}{-}
	\xmlsetsetup{#1}{document|
			hskip}{xml:*}
\stopxmlsetups

\xmlregistersetup{xml:testsetups}

\startxmlsetups xml:document
    \xmlflush{#1}
\stopxmlsetups

\startxmlsetups xml:hskip
	\hskip\xmlatt{#1}{width}
\stopxmlsetups

\starttext
	\xmlprocessbuffer{main}{test}{}
\stoptext

This gives an error with the latest lmtx (2020.11.19 11:28, linux 64 bit):

tex error       > tex error on line 10 in file ./xmltest.tex: Valid 
keyword expected, likely 'minus'


<lua output> Ma
     teriam vati da Venus alma tuo.
<macro> \22>:xml:document #1->\xmlflush {#1}

<lua output> }


<macro> \22>:xml:process #1->\xmlregistereddocumentsetups 
{#1}{#1}\xmlmain {#1}


<macro> \lxml_process ...ocument {#3}#2{#3}{#4}\setcatcodetable 
\notcatcodes \doifelsenothing {#5}{\xmlsetup 
{#3}{xml:process}}{\xmlsetup {#3}{#5}}
     \endgroup

<line 4.24>     \xmlprocessbuffer{main}{test}{}

The file compiles cleanly if I give the --luatex switch.

Now for the bizarre part: if you delete the capital M of "Materiam" or 
replace it by any other capital letter, the file compiles. What's going 
on here?

Thanks, and all best

Thomas
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