Incompatibility with mathtools and unicode-math in xelatex for \sqrt[n]{x}

[ddrcasa]

Description

unicode-math 08j released 2018-01-07: Something wrong with \sqrt[n]{x}

Check/indicate

• [x] Relevant for XeTeX
• [ ] Relevant for LuaTeX
• [ ] Issue tracker has been searched for similar issues?
• [ ] Links to discussion if appropriate

Minimal example demonstrating the issue

\documentclass{article}
\usepackage{mathtools}
\usepackage{unicode-math}
\begin{document}
     $\sqrt[3]{x}$
\end{document}

Further details

Compiling with XeLaTeX produces this error message :

Undefined control sequence \__um_mathstyle_scale:Nnn.
leading text: $\sqrt[3]{x}
Missing number, treated as zero.

[wspr]

Thanks for writing and sorry for the inconvenience. This will be fixed over the weekend.

[ddrcasa]

Thanks a lot !