All Plugins are the latest versions:
Clearcase plugin version 1.6.3
Jenkins LTS 2.49.1
Changelog used to change login names to Real Names as stored in Jenkins People.
This no longer works - login name is displayed.
This is a big step backwards.
Login names of x123sbr05 are useless in a list of changes - it used to be converted to Joe Bloggs
This is a recent regression.
None of the plugins above ( clearcase scm ) have changed recently, can't pinpoint which one yet.
Plugins updated on 14 September