Module project index page - exposed fields don't work

Forgive me if this has been reported before - I've been trying to search the issue queue for more than a day but every search results in a blank page, I think because of #2136119: Text search on issue queues is slow and sometimes WSODs.

The problem is, searching for modules via https://drupal.org/project/project_module/index doesn't work correctly anymore since the upgrade.

Specifically, if you visit the above URL you will see a list of Drupal modules with two exposed fields to let you filter your selection. This list initially contains 14160 modules. The exposed fields are "Project type" and "Drupal core version" with initial values of "Full project" and "Any", respectively. Make a selection here - for example select all 7.x modules. Press the "Apply" button. Instead of seeing a list of 7.x modules, the "Drupal core version" field is changed to "8.x" and the resulting list contains 323 module. Now change the "Project type" to "Full project", press "Apply", and you get that same list of 323 modules. Make various selections, you will see that something strange is going on here. Bottom line is the exposed fields aren't working correctly, and this page is broken.