[NTG-context] font sizes not obeyed

Dear list, yes, I do understand that it is somehow polite to use some kind of \definebodyfontenvironment for weird font sizes (but don't understand why this is needed), but the following example somehow works in MKII and produces really weird result in MKIV: \starttext Title \switchtobodyfont[5pt] Title \switchtobodyfont[10pt] Title \switchtobodyfont[14pt] Title \switchtobodyfont[15pt] Title \switchtobodyfont[50pt] Title \stoptext Is there any tiny patch for the core to fix such weird behaviour or is it forbidden to switch to font sizes in this way? Thank you, Mojca