[NTG-context] Convertnumber with \ref[number] fails in MkIV, works in LMTX

Hello list, The following fails with ConTeXt  ver: 2021.10.24 21:45 MKIV but works with the companion LMTX. The error message is:tex error       > tex error on line 6 in file G:/TestConTeXt/convert.tex: ! Incompatible glue units , pointing to the second \convertnumber line. \definelabel[XX]%[text=,before=,after=,alternative=inright] \startTEXpage[offset=2em]  abc\XX[xx]\par  \ref[number][xx] ·  \convertnumber{r}{1} ·  \convertnumber{R}{\ref[number][xx]} \stopTEXpage In this case I am trying to display with roman numerals the number generated in the label created through \definelabel. Suggestions welcomed. -- Rik