Restrict view of other users for tagging and assigning to only those in private group/private project

My users have been added as guests to a private group and private project, however when they click to assign a task they see everyone’s names, not just the names of the people specific to the private project in a private group. I would like to limit their view so they can only tag and see names of the people in their group and project. Thanks all.

This definitely shouldn’t be working like this.

Guest users can see other guest users (and their emails) when they click to assign a task!

What happens if two competitors are invited as guests inside the project management tool?

Is this even GDPR compliant?