Empty page at the end
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\starttext \startbodymatter% or backmatter etc. After this page, there is another empty one. \stopbodymatter \stoptext
Workaround:
\setupsectionblock[frontpart][page=no] \setupsectionblock[bodypart][page=no] \setupsectionblock[appendix][page=no] \setupsectionblock[backpart][page=no]