[NTG-context] Alignment on the baseline in a itemize environment with \dfrac{}{}

The alignment of the second item on the baseline is not correct if I use the command \dfrac{}{}. How to solve this problem without using the command \framed ? Best regards, Fabrice \starttext \startitemize[columns,A,joinedup,three][stopper={)},style=bold] \item $f^{\prime}(x) = \dfrac{- 1}{(x + 1)^2}$ \item $f^{\prime}(x) = 1$ \item $f^{\prime}(x) = \dfrac{1}{x + 1}$ \stopitemize \stoptext