I'm trying to force a page break in a table of contents, using what is
recommended at
https://wiki.contextgarden.net/Table_of_Contents#Forced_Page_Break

However, it does not work. Here's a MWE:

\definelistextra[page][before=\page]
\starttext
\starttitle[title={Table of contents}]
\placecontent[extras={2=page}]
\stoptitle
\startchapter[title={First chapter}]
\input knuth
\stopchapter
\startchapter[title={Second chapter}]
\input knuth
\stopchapter
\startchapter[title={Third chapter}]
\input knuth
\stopchapter
\stoptext

Is there a new way of obtaining a page break before a given part, chapter
or section in the ToC?

Thank you in advance.

-- 
Andrés Conrado Montoya
Andi Kú
andresconrado@gmail.com
http://sesentaycuatro.com
http://messier87.com
http://chiquitico.org
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Los fines no justifican los medios, porque la medida verdadera de nuestro
carácter está dada por los medios que estamos dispuestos a utilizar, no por
los fines que proclamamos.
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“You develop an instant global consciousness, a people orientation, an
intense dissatisfaction with the state of the world, and a compulsion to do
something about it. From out there on the moon, international politics look
so petty. You want to grab a politician by the scruff of the neck and drag
him a quarter of a million miles out and say, ‘Look at that, you son of a
bitch.’” — Apollo 14 astronaut Edgar Mitchell