Formula Failure in PDF reader of Zotero 6.0.8

When I use the PDF reader to view a PDF generated by Word and I found some formula cannot be shown in proper way.
What shown in the PDF reader of Zotero 6.0.8 is below:
While the proper way should be shown is:
I think it could be a bug of the PDF reader, but I can't find a solution.
Thank you for helping me!
  • My environment is:
    OS: Windows 10 21H2
    Zotero: 6.0.8

    If more information are needed, please @ me/reply me.
    Thanks again!
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