subproject alias 302 redirect to top-level project sharing alias' name

[funkyHat]

Details

I have set up a subproject,
Subproject: cloudify-openstack-plugin-fh
Alias: openstack

• Project URL: http://cfy-rtd-demo.readthedocs.io/
• Build URL (if applicable): https://readthedocs.org/projects/cfy-rtd-demo/builds/5162299/
• Read the Docs username (if applicable): funkyhat

Expected Result

When navigating to http://cfy-rtd-demo.readthedocs.io/projects/openstack

I expect to see (presumably via a redirect to http://cfy-rtd-demo.readthedocs.io/projects/openstack/en/sphinxify-rtd-demo/) my subproject's docs (sphinxify-rtd-demo is the current "active branch" for the subproject).

Actual Result

I am redirected to http://openstack.readthedocs.io/en/latest/ which is unrelated to my project:

< HTTP/1.1 302 Found
* Server nginx/1.10.0 (Ubuntu) is not blacklisted
< Server: nginx/1.10.0 (Ubuntu)
< Date: Fri, 17 Mar 2017 13:00:04 GMT
< Content-Type: text/html; charset=utf-8
< Transfer-Encoding: chunked
< Connection: keep-alive
< Vary: Accept-Language, Cookie
< Location: http://openstack.readthedocs.io/en/latest/
< Content-Language: en
< X-Fallback: True
< X-Served: Django
< X-Deity: web03

I have tried rebuilding the main project, which produced no change.

This seems potentially related to #1602