Sorting with Symbols (e.g. • or –) not correct
Sorting in Symbol Organizer should work in the same way Sketch does it:

Sketch sorting:
1. • FOO
2. 75
3. 100
4. 200
5. π BAR

Symbol Organizer sorting:
1. 100
2. 200
3. 75
4. π BAR
5. • FOO

I am using Sketch Version 69.1 (107496) and Symbol Organizer Version 15.12 on macOS 10.15.7.