Unable to render Fractur 'Z' under text mode

[untitledunrevised]

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Describe the bug:
In this section, I found that there's a parseError at 'Fractur', 'Unicode Mathematical Alphanumeric Symbols':
"KaTeX parse error: Can't use function '\mathfrak' in text mode at position 1: \̲m̲a̲t̲h̲f̲r̲a̲k̲{Z}"

To Reproduce:
Steps to reproduce the behavior:

1. Go to 'Supported Functions'
2. Click on 'Letters and Unicode'
3. Scroll down to 'Unicode Mathematical Alphanumeric Symbols'
4. See error

Expected behavior:
Maybe the same as $\frak{A}\text{-}\frak{Z} \ \frak{a}\text{-}\frak{z}$?

Screenshots:

Environment (please complete the following information):

• KaTeX Version: 0.16.9
• Device: Desktop
• OS: Windows 11
• Browser: Microsoft Edge
• Version: 117.0.2045.43

Additional context:
#3777