[2021] What happened to everyone's hair?

Please do a full **clean** re-install:

- move any valued save games elsewhere
- "uninstall" in Steam-CK3
- manually delete both the Steam/SteamApps/common/CK3 AND Documents/Paradox/CK3 folders
- re-install game in Steam, run a Steam Verify when done.
- add CK3.exe to the exceptions list of your antivirus app; ESPECIALLY if you have Windows Defender, add it to the Ransomware "Apps Allowed Through" list.
- start the game with no mods active and test

In particular make sure there are no files or folders left under either the Steam CK3 or Documents CK3 locations, before installing again.  

I see now this is called out in the 1.30 patch notes:

Crusader Kings 3 Dev Diary #52 - 1.3 ‘Corvus’ Patch Notes

Greetings! Today is the release of Northern Lords, and with it the free 1.3 patch that we’ve dubbed ‘Corvus’ in honor of Odin’s ravens! We’ve teased parts of the patch notes in previous Dev Diaries, but this time we’ll post them all - roughly 13... forum.paradoxplaza.com

NOTE: Existing characters from save games made before 1.3 might get a new haircut or become bald, and old ruler designer DNA data will not have hair/beard.

For your saves from 1.2.2 I suggest you revert to that version in the Steam Betas tab for the game, to finish those campaigns.