when(body().isInstanceOf(Collection.class)) does not work in 2.10.7

I have a body object of type ArrayList<String>, the following Java DSL when() condition incorrectly evaluates to "false" in Camel version 2.10.7. In versions 2.10.3 and 2.12.2 it evaluates correctly to "true".

when(body().isInstanceOf(Collection.class))

Using Java 6.