I had a poke round. There's a new section on the show_bug page between the status summary and the attachments list, which shows a time tracker where you say how long a job should take/is taking.
I don't think this makes any sense outside a coroporate environment, so we should turn this off. It's in an if block: [% IF user.is_timetracker %] which is set if the user is in the group "timetrackinggroup". I think it might be a new feature in Bugzilla 5 that auto set to on. Also, in the clone only one of my tracked users in email preferences -> user watching still exists, So it seems the porting hasn't migrated something properly. Nothing critical, but worth me mentioning.
