§k doesn't work in Unicode font

In Unicode font mode, the §k text works incorrectly.

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Steps to Reproduce:

• 1. Send a message "§k<text>" (<text> should only contain English characters)
• 2. Send a message "<text1>§k<text2>" (some Chinese characters should be included in <text1>, which change this message into Unicode font automatically)

Observed Results:
The first message could show correctly, but the second message didn't work. The §k text seem like some dots.

Expected Results:
§k should work in Unicode font.