I just noticed in Foreman 1.9.2 that trying to import Puppet classes for a specific Foreman environment (as opposed to importing all environments/classes) no longer works. When I attempt to import a specific environment's classes to implement new changes, the request 404's in the foreman-proxy log:

[29/Sep/2015 16:26:56] "GET /environments/15-tc/classes HTTP/1.1" 404 9 0.4811

If I click the button to import all environments/classes from the server, the proxy log records the following command that completes successfully:

 [29/Sep/2015 16:40:06] "GET /environments/tc/classes HTTP/1.1" 200 20796 0.4805

Somewhere along the line it appears that the API request got changed for one of these actions but not the other. I verified this by polling the foreman-proxy from the command line via curl. The environment name that does not contain the environment ID completes the curl and returns the classes successfully.