Infinite redirect when domain mapping attempts to log someone in

When going across domains (regardless of setting states), it causes many users to hit an infinite redirect when domain mapping attempts to log them in. Clearing cookies is the only way to force it to try the login again.

Wordpress 4.8
Domain mapping 4.4.2.5
WPMUDev Dashboard 4.3.1
Nginx 1.12.0
PHP 7.0.20