Camel: .wireTap() does not work as expected in a .doCatch() block

Issue

Consider this snippet of code:

 from("...")
            .doTry()
            ...            
           .doCatch (Exception.class)
                .wireTap ("direct:tap")
           .end()
           .log ("After top-level doCatch()");

The final .log() will not be executed unless, for some reason the wire tap route throws an exception. This is not the behaviour that would be expected, from the layout of the code -- it looks as if the .log() will be executed for each exchange.