Django 1.8 data migrations not able to locate related collections

Hello,

After upgrading to 1.8 from 1.7.7 our tests are now unable to create test data via data migrations and complain about related collections not existing as attributes for some but not all models (exception stack trace at https://travis-ci.org/virtualcommons/vcweb). It appears to succeed at creating a model object for the first related collection but then dies when attempting to create objects in the second related collection (https://github.com/virtualcommons/vcweb/blob/develop/vcweb/experiment/forestry/migrations/0001_initial_forestry.py#L62). 

Any ideas on what might be causing this? Access to related collections through the django shell and via the web interface still seem to be working fine on 1.8, it's just the data migrations that are failing.

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