Why aren't certain users able to be filtered?

[Kelsey Collins]

There are a select few users where if searched, no issues are returned even if they are assigned to a ticket. For one user, the problem seemed to have started when we updated several workflow associated add-ons. However, if I do a filter with that user in the assignee field, all applicable issues are returned, just not when they search for themselves or use the "assigned to me" filter.

[QuentinB]

Hello,
To test if this issue is related to an add-on, you can enable safe-mode and test : https://confluence.atlassian.com/upm/disabling-and-enabling-add-ons-273875716.html
Check also that  the Global Permission 'Browse Users' is correcly configured

Regards