Authentication fails with federated user if "Consent required" and "Display Client On Consent Screen" are on

Issue

Customer develops custom user federation by User Storage SPI.
When this customized user federation is enabled and if the followings are set in client configuration,

• "Consent required" on
• "Display Client On Consent Screen" on

authentication fails with CODE_TO_TOKEN_ERROR while getting token. Here are corresponding DEBUG &TRACE level logging.

2020-07-06 10:58:59,040 DEBUG [org.keycloak.protocol.oidc.TokenManager] (default task-16) Client 'app-profile-jsp' no longer has requested consent from user '****' for client scope 'app-profile-jsp'
2020-07-06 10:58:59,041 TRACE [org.keycloak.events] (default task-16) type=CODE_TO_TOKEN_ERROR, realmId=customUserFederation, clientId=app-profile-jsp, userId=f:b8f41fc1-4fd2-48d1-8214-79bec1ec8009:*****, ipAddress=127.0.0.1, error=not_allowed, grant_type=authorization_code, code_id=4c7d4a5d-942e-45d8-b12e-c44643a1eb69, client_auth_method=client-secret, requestUri=http://localhost:8080/auth/realms/customUserFederation/protocol/openid-connect/token, cookies=[]

This issue happens with all of users when customized user federation is enabled.