I have recently upgraded to 8.15.0
My users have indicated that they used to be able to use various user lookup functions within Jira and part type a name or username and have it auto complete. But since the upgrade from 8.14.0, they now have to type a name in full.
Here is a example of looking up a user in the permission helper:
1) Typing 'test' returns nothing

2) typing 'testtest' (the username), returns the user

Is this real or has it always been the case? Is it a new thing with 8.15.0? A bug or a feature?