LuaLaTeX 中 Charis SIL 字体的新错误

Question

TeX Live 中的新更新可能会出现一些问题。现在，我在使用 LuaLaTeX 编译字体时遇到了这个新错误Charis SIL。如果我更改字体（例如Gentium Plus），错误就会消失。

LaTeX3 错误：键“fontspec-renderer/Renderer”仅接受一
组固定的（LaTeX3）选择。]

编辑：我使用 Charis SIL 字体

\setmainfont{Charis SIL}[ Renderer = ICU ]

得到小型大写字母后，才发现这Renderer = ICU就是问题所在，没有它，问题就消失了。

我担心发生了什么？我使用这个配置好几年了，今天失败了。

编辑 2：这是 MWE

\documentclass{article}
\usepackage{fontspec}
\setmainfont{Charis SIL}[
Renderer = ICU
]
\usepackage{lipsum}
\begin{document}
\lipsum[1]
\end{document}

编辑 3：忘记Renderer = ICU，我的错误。我的观点是 和 存在一些问题fontspec。Charis SIL我有这个 MWE，它在 MacTeX 中编译得很好，但在 Ubuntu 18.04、TeX Live 2018 中出现错误，两者都已更新。但如果我更改字体（例如Gentium Plus），错误就会消失。

\documentclass{article}
\usepackage{fontspec}
\setmainfont{Charis SIL}[%{Gentium Plus}[%{Charis SIL}[
Ligatures = TeX,
]

%%% Microtype
\usepackage[activate={true,nocompatibility},final,tracking=alltext,letterspace=-10]{microtype} 

\usepackage{lipsum}
\begin{document}
\lipsum[1]

\textsc{Hello World!}
\end{document}

错误：

Missing number, treated as zero. \begin{document}
Missing number, treated as zero. \begin{document}
Missing number, treated as zero. \begin{document}
Missing number, treated as zero. \begin{document}
Missing number, treated as zero. \textsc{Hello World!}
Missing number, treated as zero. \textsc{Hello World!}
Missing number, treated as zero. \textsc{Hello World!}
Missing number, treated as zero. \textsc{Hello World!}
Missing number, treated as zero. \textsc{Hello World!}
Missing number, treated as zero. \textsc{Hello World!}
Missing number, treated as zero. \textsc{Hello World!}
Missing number, treated as zero. \textsc{Hello World!}
Missing number, treated as zero. \textsc{Hello World!}
Missing number, treated as zero. \textsc{Hello World!}
Missing number, treated as zero. \textsc{Hello World!}
Missing number, treated as zero. \textsc{Hello World!}
Missing number, treated as zero. \textsc{Hello World!}
Missing number, treated as zero. \textsc{Hello World!}
Missing number, treated as zero. \textsc{Hello World!}
Missing number, treated as zero. \textsc{Hello World!}
Missing number, treated as zero. \textsc{Hello World!}
Missing number, treated as zero. \textsc{Hello World!}
Missing number, treated as zero. \textsc{Hello World!}
Missing number, treated as zero. \textsc{Hello World!}
Missing number, treated as zero. \textsc{Hello World!}
Missing number, treated as zero. \textsc{Hello World!}

重点是，我使用了几个具有类似模板的文件，涉及Charis SIL几年，但昨天（2019 年 2 月 26 日）它们全部编译失败。如果我将字体更改为 ，相同的文件可以正常工作Gentium Plus。