Camel hystrix does not handle exceptions properly

Exceptions in the route executed by Hystrix are not propagated to Hystrix itself and main features such as "circuit open" are not available, when errors pack up. The scenario was working with fallbackEnabled="true" in 2.18.1.
I have prepared a JUnit test: https://github.com/anton-k11/camel/blob/cffa13cb8106731ba94aaff85a9dd81715315306/components/camel-hystrix/src/test/java/org/apache/camel/component/hystrix/processor/HystrixCircutExceptionTest.java
The test works fine if the IOException on line 110 is comment out and instead a Thread.sleep is used to simulate timeout.