ConTeXt: Missing Chapter Numbers

Question

Code

Minimum working example (MWE):

\setuphead[chapter][number=yes,]
\setuphead[section][number=no,]
\setuphead[subsection][placehead=hidden,]

\definehead[scenesubsection][subsection]

\starttext
  \dorecurse{5}{
    \chapter{Chapter Name}
    \section{Section Name}
    \startscenesubsection
    \input tufte
    \stopscenesubsection
  }
\stoptext

Problem

The chapter headings should be enumerated 1 through 5, but some chapter numbers are either hidden or enumerated incorrectly.

The following figure shows the MWE output:

Question

How can the problems with chapter numbering be resolved?

Additional Details

$ context --version
mtx-context     | current version: 2017.05.14 19:09

Work Around

Using placehead=no causes the spacing to change when framing an entire section:

I get the same weird behaviour, and don't understand it. I wonder though, do you really need \startscenesubsection ... \stopscenesubsection—with placehead=hidden the scenesubsection headers might as well not be there, and removing them seems to resolve the issue. — 9tTn9B, May 19 '17 at 09:04
Seems to be not yet fully implemented. There is a todo in the code. — Henri Menke, May 19 '17 at 11:08
\startscenesubsection\getheadsyncs works for me on TL2016. I was not yet able to track it down though. — Henri Menke, May 21 '17 at 00:29

score 2 · Accepted Answer · answered May 20 '17 at 04:16

Use a custom counter:

\definecounter[ChapterNumber][
  way=bytext,
  prefix=no,
]

\define[1]\CustomChapter{%
  \incrementcounter[ChapterNumber] 
  \rawcountervalue[ChapterNumber] 
  \hspace[medium]
  #1
} 

\setuphead[chapter][
  align=middle,
  number=no,
  textcommand=\CustomChapter,
]

\setuphead[section][
  align=middle,
  number=no,
]

\setuphead[subsection][
  placehead=hidden,
  number=no,
]

\definehead[scenesubsection][subsection]