[NTG-context] LMTX fails with custom tags (MkIV continues to work)

[Rik Kabel]

Documents fail with an error when they include \startelement[tagname]. 
This started on or before the 2020.11.17T12:42 LMTX update, and 
continues with 2020.11.18 19:16 LMTX. MkIV continues to work as expected.

Example:

    \setelementbackendtag[myTag]
    \setelementnature[myTag][mixed]

    \starttext

      \startelement[myTag]                     % <---

       This works with MkIV but fails with LMTX, complaining: {\tt
       tex error on line 17 in file G:/extract.mkvi: The file ended
       when scanning an argument.}

       It works in LMTX when marked lines are removed, but\unknown

      \stopelement                              % <---

    \stoptext

-- 
Rik

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