Some Material Design Icon glyphs not in new v3.0 codepoints?
### Requirements

- [x] I have searched the [issues](https://github.com/ryanoasis/nerd-fonts/issues) for my issue and ~~found nothing related or helpful~~*included what I found*
- [x] I have searched the [FAQ](https://github.com/ryanoasis/nerd-fonts/wiki/FAQ-and-Troubleshooting) for help
- [x] I have checked the [Wiki](https://github.com/ryanoasis/nerd-fonts/wiki) for help

### Experienced Behavior

Hi :)

I'm in the process of replacing my version 2 nerd fonts across the board, so moving to the new code points for material design icons after #365 / #773. But in trying to migrate one of the glyphs: `nf-mdi-square_inc` (the old, conflicting codepoint was U+F9C9 (柳)), I couldn't find a replacement in the cheatsheet:

![Image](https://github.com/user-attachments/assets/9ad63552-87e2-47bc-94a2-2bb7181fdd1e)

(searching for just `square` doesn't bring up the icon either; nor do external tools like [nerdfix](https://github.com/loichyan/nerdfix))

Is this intended? Are there some material design icon glyphs that were simply removed and not allocated new codepoints in the move? From what I can tell, the symbol was not removed from MD itself, so I'm a bit confused ^^.
