[NTG-context] Strange math error (bug ??)

Hello, The following is quit strange, in the first formula the [{Q}, {R} ] on the left hand side of the \rightarrow is not processed but on the right hand side of the \rightarrow it is processed (?) \starttext The left side with $[Q,R]$ does not show, but the right side with $[Q,R]$ does show, what is happening here ??? \startformula [ {Q} , {R} ] \rightarrow \frac{1}{i \hslash} [ {Q} , {R} ] \stopformula \stoptext Kind regards Wim