unicode-math 與 XeLaTeX \left( 和 \right) 未正確渲染

Question

我在 OS X Sierra 上使用 XeLaTeX (XeTeX 3.14159265-2.6-0.99992 (TeX Live 2015))，透過編譯rubber

\documentclass[letterpaper, 11pt]{article}
\usepackage{geometry}
\usepackage{amsmath}
% rubber: set program xelatex
\usepackage{unicode-math}
\setmathfont{STIX Two Math}
\setmainfont{STIX Two Text}

\begin{document}
This is the problem $\frac{\left(asdf\right)}{\left(ghjk\right)}$
\[ \frac{\frac{\left(asdf\right)}{\left(ghjk\right)}}{\frac{\left(asdf\right)}{\left(ghjk\right)}} \]
\[ \frac{\left(asdf\right)}{\left(ghjk\right)} \]
\begin{align*}
    \frac{\frac{\left(asdf\right)}{\left(ghjk\right)}}{\frac{\left(asdf\right)}{\left(ghjk\right)}} \\
    \frac{\left(asdf\right)}{\left(ghjk\right)} 
\end{align*}

\end{document}

將 STIX 2.0.0 字體與 unicode-math 和 XeLaTeX 一起使用會導致括號 和\left(渲染\right)不正確（作為帶框的問號），而常規(和)字元渲染正確。我對\left[和沒有遇到同樣的問題\right]。

日誌輸出的唯一差異是以下幾行：
Missing character: There is no Ⴞ in font STIX Two Math/OT:script=math;language= DFLT;! Missing character: There is no Ⴟ in font STIX Two Math/OT:script=math;language= DFLT;!

誰能幫我解決這個問題嗎？

---

非常小的例子：

\documentclass{article}
\usepackage{unicode-math}
\setmathfont{STIX Two Math}

\begin{document}

$\left(\right)$
$\scriptstyle\left(\right)$
$\scriptscriptstyle\left(\right)$

%\showoutput

\end{document}

Missing character: There is no Ⴞ in font STIX Two Math/OT:script=math;language=DFLT;!
Missing character: There is no Ⴟ in font STIX Two Math/OT:script=math;language=DFLT;!
Missing character: There is no ᆷ in font STIX Two Math/OT:script=math;language=DFLT;+ssty=0;!
Missing character: There is no ^^@ in font STIX Two Math/OT:script=math;language=DFLT;!
Missing character: There is no ᆸ in font STIX Two Math/OT:script=math;language=DFLT;+ssty=0;!
Missing character: There is no ^^@ in font STIX Two Math/OT:script=math;language=DFLT;!