\SetTracking 在 microtype 中对 mathdesign 无效

Question

我喜欢这种跟踪，但我希望稍微减少一点间距。但它不起作用：

\documentclass[twoside,a4paper,12pt]{article}    
%\usepackage[T1]{fontenc}


\usepackage[charter]{mathdesign}

\usepackage[
protrusion=true,
tracking=true,
]{microtype}
\SetTracking{encoding={*}, family= mdbhc, shape=sc}{900}


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\begin{document}



\textsc{My text}
\end{document}

所以

\SetTracking{encoding={*}, family= mdbhc, shape=sc}{900}

对间距没有影响。

当我注释掉 mathdesign 的使用以使用默认字体时，settracking 被使用并且运行良好。我昨天安装了 microtype 包，因此它是最新的可用包。