[NTG-context] Nested modes and itemizations

Hi, I have the following minimal not-working example: \starttext \startitemize \item One \startmode[modeA] \item Two \startitemize \startmode[modeB] % <- this \item Two A % <- does \stopmode % <- not work % \doifmode{modeB}{\item Two A} % <- this works \item Two B \stopitemize \stopmode \stopitemize \stoptext Note that both modeA and modeB are not defined and hence not enabled. When compiled with the latest version of ConTeXt MkIV, I get: Missing number, treated as zero. However, If I use the inline version \doifmode instead of the environment version \startmode \stopmode, then the example compiles without problem. I am afraid but this may be a bug. Cheers, Christoph