[NTG-context] outlinetext, fractions, and square roots

Hi, When experimenting with outlinetext, I found it generally works well for both text and equations but seems to fail for fractions or square roots. The code below demonstrates the issue: ____________________________ \startMPpage draw outlinetext("$\frac{1}{\sqrt{2}}$"); \stopMPpage ____________________________ The ‘1’ and ‘2’ seem to be at the right positions, but the fraction bar and horizontal part of the radical are missing. Is there a different fonction I should use for getting the outlines of equations? Best regards, Florent