Ember.js: disappearing component properties while performing acceptance tests

I have a component listing-table which takes a number of properties, like this:

This works as intended, and the integration tests also work just fine. However, my acceptance tests fail, because apparently my exclude property is not being taken into account while running an acceptance test.

I have tested this by printing to console the value of this.get('exclude') in the component's javascript file and getting undefined. However, printing e.g. this.get('type') yields the expected results.

I have then, for testing purposes, removed exclude and replaced type's value with it, i.e. type='endpointName,typeName', however, I would get the previous value in the console, e.g. user.

This is all way beyond puzzling, and I'd really like to know what's the matter with acceptance test. Any sort of hints are more than welcome, and thanks for your time!