in particular \startsection for example breaks the mecanism
\setuppapersize [A4]
\setupheader [state=empty, no]
\usetypescript[ibmplex]
\setupbodyfont[ibmplex, serif, 11pt]
% \setupinterlinespace[14pt] % LET DEFAULT
\setuplayout[%
backspace=10mm,
topspace=20mm,
header=0mm,
footer=0mm,
height=180mm,
]
\definelayout[one][width=98.8mm]
\definelayout[two][width=158.2mm]
\definelayout[1,2,5,6][one]
\definelayout[3,4,7,8][two]
%=================================================
\startuseMPgraphic{testA}
path p ;
p := fullsquare xscaled 98.8mm yscaled 180mm;
lmt_parshape [ path = p,] ;
\stopuseMPgraphic
\startuseMPgraphic{testB}
path p ;
p := fullsquare xscaled 158.2mm yscaled 180mm;
lmt_parshape [ path = p,] ;
\stopuseMPgraphic
\startshapetext
[testA,testB,testA,testB,testA,testB,
testA,testB,testA,testB,testA,testB,
testA]
\setupalign[verytolerant,stretch,normal]
{\bf\strut This is the beginning}.\endgraf % DON'T FORGET THE STRUT HERE
\dorecurse{30}
{\strut\color[middlemagenta]{\bf \recurselevel}\endgraf
\startsection[title={section \recurselevel}]\input knuth\stopsection}
{\bf This is the end}.
\stopshapetext
%=================================================
\showframe
\showgrid
\starttext
\dorecurse{13}{\getshapetext}
\stoptext
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