[NTG-context] lmmath and \cong

Dear list, There might be something obviously wrong with the following minimal example, but it doesn't show the "\cong" symbol. \enablemode[lmmath] \starttext \math{{\cal B} \cong {\cal C}} \stoptext I use lmmath to have the same output on calligraphic characters as with latex. My context version is beta, less than a fortnight old. Regards, Chris