The example below is taken from the wiki article "Titles," with pdf bookmark apparatus prepended and a second chapter added to the bodymatter.

In the log, this produces the lines:

backend         > bookmarks > confusing level change at level 3 around '1 body'
backend         > bookmarks > confusing level change at level 3 around 'A appendix'
backend         > bookmarks > confusing level change at level 3 around 'back'

\setupinteraction[state=start]
\placebookmarks[chapter, section, subsection, subsubsection]
               [chapter,section]
\setupsectionblock[frontpart][page=]
\setupsectionblock[bodypart] [page=]
\setupsectionblock[backpart] [page=]
\setupsectionblock[appendix] [page=]
\definepagebreak[firstpagebreak][yes,header,footer,right]
\setuphead[chapter][page=firstpagebreak]
\setuppagenumbering[alternative=doublesided]
\starttext
\startfrontmatter
\chapter{front}
\stopfrontmatter
\startbodymatter
\chapter{body}
\chapter{body}
\stopbodymatter
\startappendices
\chapter{appendix}
\stopappendices
\startbackmatter
\chapter{back}
\stopbackmatter
\stoptext

--
Rik