When I open a host group, there are no assigned/avaliable puppet classes.

If I make save changes to a host group, the assigned puppet classes are removed.

Additionally, classes are only selectable if I:

1. Edit the hostgroup
2. Change the environment from the desired value
3. Change the environment back to desired value.
4. Switch over to the puppet classes tabs
5. Re-assign classes
6. Save.

After saving, hammer shows the classes are assigned.

This pretty much makes the hostgroups unusable from the UI since they are wiping out all the classes.

Updating a hostgroup from hammer appears to work correctly.