Human tasks are not displayed to the user in JBPM (with Keycloak adapter)

I configured the JBPM with Keycloak (using a adapter), I follow this documentation.

Business Process

Process instance:

I can create a Process Instance with a Human Task, but after that, tasks are not displayed to the user.

I realized that the initiator variable got the name unknown and I believe that's the problem, but i have no idea how to solve it.

 

When I'm using JBPM without Keycloak, this name is correct, and the Task list are displayed.

Keycloak configs:

Client:

User Roles:

JBPM Configs:
standalone-full.xml:

keycloak version: keycloak-13.0.1

keycloak adapter version: keycloak-wildfly-adapter-dist-13.0.1

jbpm version: jbpm-server-7.54.0.Final