Currently we are working on a free plan and there are about 25 people on the project. When I open a new issue and try to select an assignee, the assignee I am looking for does not show up on this list but others(red box in the image below). However When I try to find the same person in the green box it does appear with at sign (@).
I am pretty sure they are in the group and it does show the users in the red box. But there are only 20 users to choose. Do you think the maximum number of assignees on a free plan is 20?