Various unicode symbols fail to display anywhere in the application after being displayed in italics

Tested on Windows 11 with Racket 8.8

Steps to reproduce:

1. Open DrRacket
2. Create a new racket file
3. Paste 𝕣 into it

Once this is done, every 𝕣 character within the current window, as well as any 𝕣 characters displayed in new windows, will experience the bug until the application is completely restarted.

To confirm that italics are specifically the cause, you can reproduce the bug with comments if you change their style settings. Conversely, you can eliminate the bug from the REPL if you change it to not italicize errors.

Originally I encountered this problem just with the less conventional double struck letters (i.e everything but ℂ, ℍ, ℕ, ℙ, ℚ, ℝ, and ℤ), but looking into it further it seems to affect other characters like ⟜⌾◶⎉⍟⎊⥊⌽⍉⍋⍒⍷. They're all mathematical so far, but that could just be because I haven't tested much else. As for how broken italics breaks every other instance of the character, that's still a complete mystery to me.

For the time being, is there a way to disable italics for status bar error messages like there is for REPL ones?

Start by reproducing the issue in DrRacket on Windows 11 with Racket 8.8, using the pasted 𝕣 character and then comparing italicized comments, errors, and status-bar messages. Trace the italic rendering path and verify that mathematical Unicode symbols continue displaying correctly across the current and newly opened windows after the fix.