为什么下图中的每个文本数字符号都被符号替换？MWE：
\documentclass{article}
\usepackage{polyglossia}
\setdefaultlanguage{russian}
\setmainfont{CMU Serif}
\begin{document}
№
\end{document}
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entering extended mode
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LaTeX Font Info: Redeclaring math symbol \Delta on input line 7.
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LaTeX Font Info: Redeclaring math symbol \Lambda on input line 7.
LaTeX Font Info: Redeclaring math symbol \Xi on input line 7.
LaTeX Font Info: Redeclaring math symbol \Pi on input line 7.
LaTeX Font Info: Redeclaring math symbol \Sigma on input line 7.
LaTeX Font Info: Redeclaring math symbol \Upsilon on input line 7.
LaTeX Font Info: Redeclaring math symbol \Phi on input line 7.
LaTeX Font Info: Redeclaring math symbol \Psi on input line 7.
LaTeX Font Info: Redeclaring math symbol \Omega on input line 7.
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(Font) `operators' in the math version `bold' on input line 7.
LaTeX Font Info: Overwriting symbol font `operators' in version `bold'
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(Font) TU/CMUSerif(0)/m/n --> TU/CMUSerif(0)/m/n on input line
7.
LaTeX Font Info: Overwriting math alphabet `\mathit' in version `normal'
(Font) OT1/cmr/m/it --> TU/CMUSerif(0)/m/it on input line 7.
LaTeX Font Info: Overwriting math alphabet `\mathbf' in version `normal'
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LaTeX Font Info: Overwriting math alphabet `\mathsf' in version `normal'
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LaTeX Font Info: Overwriting math alphabet `\mathtt' in version `normal'
(Font) OT1/cmtt/m/n --> TU/lmtt/m/n on input line 7.
LaTeX Font Info: Overwriting symbol font `operators' in version `bold'
(Font) TU/CMUSerif(0)/m/n --> TU/CMUSerif(0)/bx/n on input lin
e 7.
LaTeX Font Info: Overwriting math alphabet `\mathit' in version `bold'
(Font) OT1/cmr/bx/it --> TU/CMUSerif(0)/bx/it on input line 7.
LaTeX Font Info: Overwriting math alphabet `\mathsf' in version `bold'
(Font) OT1/cmss/bx/n --> TU/lmss/bx/n on input line 7.
LaTeX Font Info: Overwriting math alphabet `\mathtt' in version `bold'
(Font) OT1/cmtt/m/n --> TU/lmtt/bx/n on input line 7.
Missing character: There is no № in font CMU Serif Roman/OT:script=cyrl;languag
e=DFLT;mapping=tex-text;!
[1
] (document.aux) )
Here is how much of TeX's memory you used:
12283 strings out of 427796
263439 string characters out of 3151768
346175 words of memory out of 3000000
16278 multiletter control sequences out of 15000+200000
532418 words of font info for 34 fonts, out of 3000000 for 9000
1328 hyphenation exceptions out of 8191
45i,4n,67p,829b,443s stack positions out of 5000i,500n,10000p,200000b,50000s
Output written on document.pdf (1 page).
UPD：完全重新安装字体 CMU 有帮助。