Java 1.8 Coverage not computed correctly when using lambdas

I've started to see some strange coverage results when using Lambdas.

All elements are covered. But clover reports uncovered elements.
For example, here http://www.cakeframework.org/snapshot/clover/org/cakeframework/util/Id160.html

All elements are covered but clover reports only 99.6 % coverage.

Might be some synthetic methods that are generated by the compiler that is not covered?