Steps to reproduce:

1. Login with LDAP authentication.
2. Attempt to change bind password setting for LDAP Setting in Administratrion > Authentication

Result:

Fatal error, please report to the Zabbix team

• Incorrect value for "passwd_check_rules" field.
• Controller: authentication.edit
• action: authentication.edit
• action_passw_change: authentication.edit
• authentication_type: 1
• change_bind_password: 1
• db_authentication_type: 1
• form_refresh: 1
• http_auth_enabled: 0
• ldap_base_dn: DC=some,DC=domain,DC=local
• ldap_bind_dn: CN=someaccount,OU=This,OU=My,OU=Favorite,OU=OU,DC=some,DC=domain,DC=local
• ldap_case_sensitive: 1
• ldap_configured: 1
• ldap_host: ldap://some.domain.local
• ldap_port: 389
• ldap_search_attribute: sAMAccountName
• ldap_test_password:
• ldap_test_user: [redacted]
• passwd_check_rules: array
• passwd_min_length: 8
• saml_auth_enabled: 0

Expected:
Change password option to be available.