[NTG-context] cal & calligraphic

I am confused about the behaviour of \cal and calligraphic. In a font where the calligraphic letters are in MathItalic all goes well. But, in a font where the calligraphic letters come from another font I get: \definefontsynonym [Calligraphic] [FONT_OTHER_THAN_MathSymbol] in text: \calligraphic{ABC} is ok in text: {\cal ABC} is ok in math: $\calligraphic{ABC}$ is ok in text: ${\cal ABC}$ IS NOT OK, SYMBOLS KEEP COMING FROM MATHSYMBOL I would the font redefinition also being obeyed in math {\cal} ? Why is this the only exception? yours sincerely, dr. H. van der Meer