When Vendor Core plugin is installed, unable to view assigned_to and caller_id fields on the incident form or any fields that have reference to a sys_user record.
All available releases
When the Vendor Core plugin is installed, it creates a read ACL on the sys_user table that enables users with the vendor_contact role to access the records. If the user does not have any ACL that overrides this one, all the other users (except admins) will not have read access to the sys_user records.
The user will have to either modify the ACL by adding roles or editing the script or deactivate the ACL for other users to see the sys_user records.