With the View As feature turned on, I attempted to remove someone from a test project, or from a role in a test project. Either activity resulted in an endlessly spinning circle on the dialog to remove them.
I switched the feature off and the user did not show up on the internal team at all.
I added a new user to replace them in that role and with the view as feature off was able to assign them the same role.
With the feature turned on, now I show two people in that role. The original user (X in the screenshots) and the new user (4).
Screenshots:
View As On:
View As Off: