I found a MWE that shows the problem:
"""
\setuppapersize[C5]
\showframe
\starttext
\startplacefigure[location=page,title={Pagefloat}]
\framed[width=\textwidth,height=.75\textheight]{TEST}
\stopplacefigure
\dorecurse{4}{\section{Tufte \recurselevel}
\samplefile{tufte}}
\stoptext
"""
If the page float is placed before a title, the next section starts
below the float.
Hraban
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