to delete the user you need to enter their password

I start to think this might be a bug in Catalina.

STEPS TO REPRODUCE:

1. I formatted my Mac-mini to factory reset (don't remember if was High Sierra or Mojave)
2. I created a user at first startup.
3. I upgraded to Catalina
4. After Catalina installation I create a few users admin and non
5. With a new admin user I can delete other admin or standard users without problem but I cannot delete the user created previously to Catalina. The message says:

to delete the user you need to enter their password

I did it several time, is the password I still use it to login with that user and it won't delete the account.

(In the picture here you can see the problem with the very last user)

So there must have been some sort of change between OS version and users created after Catalina cannot manage users created before Catalina.

I also tried to change the password for the user, the problem persists.