User schema attributes that are marked read-only do not seem to get populated by synchronization.
Configure a user schema attribute as read-only, create a (ldap) connector and resource, map the read-only attribute to an external (ldap) attribute, run a sync task.
All read-write attributes are sync'd as expected, read-only attributes remain blank (checked via CXF REST API "get" and via console). The attributes are grayed out (i.e. read-only) but blank on the console, the attributes don't even show up in the REST API output. There are no relevant ERROR or WARN messages in the logs that I can see.
The read-only attributes are imported (sync'd) from the external resource, and displayed in Syncope, but are not editable within syncope.
Don't mark any attributes as read-only in the schema.