Note To Self is listed under the wrong letter

• I have searched open and closed issues for duplicates
• I am submitting a bug report for existing functionality that does not work as intended
• I have read https://github.com/signalapp/Signal-Android/wiki/Submitting-useful-bug-reports
• This isn't a feature request or a discussion topic

Bug description

Note To Self is listed in the "wrong" place in the contact list.

Steps to reproduce

1. Add yourself as a contact in your phone's address book
2. Give Signal access to phone's contacts
3. Open Signal and tap the pencil icon
4. Look for "Note To Self"

Actual result: "Note To Self" will be listed in the position it would normally be displayed in if it were a regular contact -- eg, if your name is "Herohtar" it will show up under the "H" section in the appropriate alphabetical ordering.
Expected result: "Note To Self" should show up under "N", or at the very top as a special conversation option.

Device info

Device: Pixel 5
Android version: 11
Signal version: 5.10.8

Start by reproducing the issue in Signal Android using the listed contact-list steps, then trace the code that builds and orders the contact list. Done means Note To Self appears under N or at the top as a special conversation option, while regular contacts retain their expected ordering.