Adding a new paragraph to the document (by pressing Enter) and then copying the content, except for the new paragraph, into a new, blank document works around the issue, so there is clearly something about the formatting in the original document.

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Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional

Hi, if you try to copy this paragraph into a new document, the problem is still there. Even if you copy it to a notepad and then copy it again to Word, the problem is there.

In Word, adding a blank paragraph and omitting that paragraph before copying and pasting into a new, blank document did not work for you?

That suggests that the problem exists in the Normal template as well.

Have you ever had any settings for Asian languages enabled in Word/Office?

__________________
Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional

That is right. Asian languages (Chinese) is enabled in my computer. In Word, it can also read Asian language.