v2.0.12. Display name for user account (keycloak) are all lower case letters

[patrickdung]

Question
Describe in details what you are trying to achieve and where do you need guidance.
I add an user via Keycloak authentication provider. I entered username as 'Patrick Dung'. But after the user had log-in, the displayed name of the user is changed to all lower case letters (patrickdung):

ID Name Email Provider Created
4 Patrick Dung patrickdung@localhost ldap a day ago
3 patrickdung patrickdung@localhost keycloak a day ago

Host Info (please complete the following information):
OS: Fedora 31, nodejs 12.13
Wiki.js version: 2.0.12
Database engine: postgresql 12