Glyph corruption when pasting custom Unicode text from web sources into Illustrator text frames

Hi everyone,

I'm experiencing an issue with character rendering in Adobe Illustrator (latest version on Windows 11).

When copying stylized Unicode text generated from web platforms like <irrelevant link removed-kglad> and pasting it directly into a standard text box, some characters display as empty boxes (tofu glyphs) or drop entirely, even when using common OpenType fonts like Montserrat or Arial.

Here is what I've tried so far:
- Resetting the Type tool preferences.
- Checking 'Enable Missing Glyph Protection' in Preferences > Type.
- Changing font fallback settings.

Is there a specific setting in Illustrator or Typekit to force proper UTF-8 character encoding for custom glyphs pasted from external web sources? 

Any insights or recommended workflows would be greatly appreciated!