LDAP fields with Turkish characters generate JSON errors

[osmanyozgatlioglu]

My standart setup is;

Redmine 5.0.6.stable
Environment:
Redmine version 5.0.6.stable
Ruby version 3.1.4-p223 (2023-03-30) [x86_64-linux]
Rails version 6.1.7.6
Environment production
Database adapter PostgreSQL
Mailer queue ActiveJob::QueueAdapters::AsyncAdapter
Mailer delivery smtp
Redmine settings:
Redmine theme Default
SCM:
Git 2.39.3
Filesystem
Redmine plugins:
redmine_openid_connect 0.9.4

Redmine Openid Connect plugin configuration;

OpenID Connect Configuration Enabled
Client ID redmineclient
OpenID Connect server url https://keycloak.mezitli.local/realms/redminerealm
Client Secret ••••••••••••••••••••••••••••••••
OpenID Connect scopes (comma-separated) openid
Authorized group (blank if all users are authorized)
Admins group (members of this group are treated as admin) admin
How often to retrieve openid configuration (default 1 day)
Disable Ssl Validation Selected
Login Selector
Create user if not exists Selected
Users from the following auth sources will be required to login with SSO

At Keycloak, I have LDAP user federation and map givenName as firstName (Osman) and sn as lastName (Yozgatlıoğlu), (ldap representation is sn:: WW96Z2F0bMSxb8SfbHU=)

When I try to login Redmine, following log generated;

I, [2023-11-23T10:32:31.801419 #11303] INFO -- : [7164e47b-8eca-44d8-8c9c-2ec5a52f7d80] Started GET "/oic/local_login?state=e36e1320-2f8f-415d-af7e-d42bf4ef2d79&session_state=1876cf6a-6205-44d7-80c4-44abb6616e99&code=bc2ca79e-6845-408e-9912-4f2b3784d6e4.1876cf6a-6205-44d7-80c4-44abb6616e99.3fd2d239-d3f3-421c-be94-7f2872e31129" for 192.168.1.50 at 2023-11-23 10:32:31 +0300
I, [2023-11-23T10:32:31.802501 #11303] INFO -- : [7164e47b-8eca-44d8-8c9c-2ec5a52f7d80] Processing by AccountController#oic_local_login as HTML
I, [2023-11-23T10:32:31.802728 #11303] INFO -- : [7164e47b-8eca-44d8-8c9c-2ec5a52f7d80] Parameters: {"state"=>"e36e1320-2f8f-415d-af7e-d42bf4ef2d79", "session_state"=>"1876cf6a-6205-44d7-80c4-44abb6616e99", "code"=>"bc2ca79e-6845-408e-9912-4f2b3784d6e4.1876cf6a-6205-44d7-80c4-44abb6616e99.3fd2d239-d3f3-421c-be94-7f2872e31129"}
I, [2023-11-23T10:32:31.810147 #11303] INFO -- : [7164e47b-8eca-44d8-8c9c-2ec5a52f7d80] Current user: anonymous
I, [2023-11-23T10:32:31.815778 #11303] INFO -- : [7164e47b-8eca-44d8-8c9c-2ec5a52f7d80] Completed 500 Internal Server Error in 13ms (ActiveRecord: 3.4ms | Allocations: 4328)
F, [2023-11-23T10:32:31.816626 #11303] FATAL -- : [7164e47b-8eca-44d8-8c9c-2ec5a52f7d80]
[7164e47b-8eca-44d8-8c9c-2ec5a52f7d80] JSON::ParserError (859: unexpected token at '{"exp":1700718146,"iat":1700717846,"auth_time":1700717846,"jti":"da731fa1-6e34-49e2-8109-75ab91ef9527","iss":"https://keycloak.mezitli.local/realms/redminerealm","aud":"redmineclient","sub":"f:b88a00eb-702a-41e6-b4e2-12e36cab75f9:osman3.yozgatlioglu","typ":"ID","azp":"redmineclient","nonce":"63baad13-df0b-4a9c-bf65-4df6af49147c","session_state":"da390142-92ff-475c-8515-e94a99420dd6","at_hash":"oNgyw_XTDaNBgdS2bSroKw","acr":"1","sid":"da390142-92ff-475c-8515-e94a99420dd6","email_verified":true,"name":"Osman Yozgatlıoğlu","preferred_username":"osman3.yozgatlioglu","given_name":"Osman","family_name":"Yozgatlıa'�H�[XZ�����X[��[ޙ�]�[��P�\�X^�[�[K���K���'):
[7164e47b-8eca-44d8-8c9c-2ec5a52f7d80]
[7164e47b-8eca-44d8-8c9c-2ec5a52f7d80] plugins/redmine_openid_connect/app/models/oic_session.rb:101:in parse_token' [7164e47b-8eca-44d8-8c9c-2ec5a52f7d80] plugins/redmine_openid_connect/app/models/oic_session.rb:106:in claims'
[7164e47b-8eca-44d8-8c9c-2ec5a52f7d80] plugins/redmine_openid_connect/lib/redmine_openid_connect/account_controller_patch.rb:75:in oic_local_login' [7164e47b-8eca-44d8-8c9c-2ec5a52f7d80] lib/redmine/sudo_mode.rb:61:in sudo_mode'

Browser shows following error;

Internal error
An error occurred on the page you were trying to access.
If you continue to experience problems please contact your Redmine administrator for assistance.
If you are the Redmine administrator, check your log files for details about the error.

Also no new user created. If I try any user with only English characters, I can login successfully and user created at Redmine.
If you need any other info, I have test setup ready.

Regards,