Capacity field breaks views

I also hit this problem. It happens when an event instance is a relationship in a View. The Views field handler is written in a way that it expects the eventinstance entity to be the base entity for the view.

This happens also with the other fields (availability, waitlist and registration count).

We should use $this->getEntity($values) which will resolve the correct entity type, rather than accessing the raw data directly with $values->_entity.