I am relatively new to ConTeXt and have encountered something that does not
work as I expected it to based on various documentation and examples.

My book design requires the front matter to contain an abridged table of
contents just for chapters, and a detailed table of contents in the back
matter.

Everything worked fine -- including the PDF bookmarks and table of contents
-- until I started using \writetolist to manually inject additional
sections and subsections into their respective lists. The manually injected
entries do show up (as I expected), but their corresponding PDF bookmarks
get repeated (not what I expected).

Here is a M(not)WD:

###begin
\setupinteraction[state=start]
\placebookmarks[chapter, section][chapter, section]
\setupinteractionscreen[option=bookmark]

\starttext

  \startfrontmatter
    \title{Contents}
    \placelist[chapter]
  \stopfrontmatter

  \startbodymatter
    \chapter{Chapter ONE}
    \section{Section ONE}
    \writetolist[section]{}{Section via writetolist ONE}
    \chapter{Chapter TWO}
  \stopbodymatter

  \startbackmatter
    \chapter{Detailed Table of Contents}
    \placecontent[criterium=all]
  \stopbackmatter

\stoptext
###end

The repetitions go away when any one of the following is done:
-- commenting out the front/body/back commands
-- commenting out both contents at front and back
-- commenting out just back contents
-- commenting out the \writetolist

Have I misunderstood something?

Many thanks,
Musa