[Domain Mapping] Domain Mapping beta doesn't follow http / https mapping redirect

Domain mapping setup:
https://rootdomain.com/someblog redirected to http://somemappedomain.com

However, in this beta, http/https is not respected, and if you access https://rootdomain.com/someblog you'll be redirected to https://somemappedomain.com (causing security error)

Previous versions correctly respected http/https that was selected when mapping the domain.

Additional domain mapping settings:
force https for dashboard TRUE
force https for front end TRUE
Single sign on TRUE