[NTG-context] Tables in multiple columns?

[Bruce Horrocks]

There's an example in the Wiki on how to put a table into multiple columns that no longer works in LMTX (version 2020.11.05 23:01).
<https://wiki.contextgarden.net/TABLE#Tables_in_multiple_columns>

\starttext
\startcolumns[n=3]
\bTABLE
\dorecurse{21}
{\bTR \bTD a\eTD \bTD b \eTD \eTR}
\eTABLE
\stopcolumns
\stoptext

I'm interested because I have a long thin table that I would to avoid having to manually split, but I would also like the heading to repeat at the top of each column and \starttabulation doesn't do the latter. I was hoping that \bTABLE did.

--
Bruce Horrocks
Hampshire, UK