This started in 1.8.7, and persists in 1.8.8.

Consider the following code:

	template <
		typename ThisImplementation,
		typename ThisInterface = Consumer
	>
	class DefaultConsumer:
	public ThisInterface {
		// ...
	};

	class Evaluator:
	public DefaultConsumer<Evaluator> {
		// ...
	};

Prior to 1.8.7, the hierarchy correctly showed that Evaluator derived from DefaultConsumer<Evaluator, Consumer>, which in turn derived from Consumer.

In 1.8.7 and 1.8.8, the hierarchy incorrectly shows that Evaluator derives from DefaultConsumer<Evaluator>, which derives from "ThisInterface".