Hello,

There is a numberconversion problem in caption prefixes. For instance, if chapter numbers are set to Romannumerals, the conversion of the caption prefixes depends on the presence of a section

Minimal example:

\setuphead[chapter][conversion=Romannumerals]

\setupcaption[way=bychapter, prefixsegments=chapter]

\starttext

\chapter{Cool}

\placefigure{A cow}{\externalfigure[cow]}

\chapter{Cat}

\section{Mouse}

\section{Dog}

\placefigure{A cow}{\externalfigure[cow]}

\stoptext

The previous code displays an inconsistent caption prefix (first time a Romannumeral, second time a number):

I Cool

[figure] Figure I.1 A cow

II Cat

2.1 Mouse

2.2 Dog

[figure] Figure 2.1 A cow