With rakudo commit 5435f32949 the test passes again on JVM. I'm closing this ticket.
[perl #64766] [JVM] Possibly inconsistent behaviour in mixing-in of 'handles'
Christian Bartolomaeus via RT Wed, 28 Sep 2016 12:29:48 -0700
Christian Bartolomaeus via RT Wed, 28 Sep 2016 12:29:48 -0700
With rakudo commit 5435f32949 the test passes again on JVM. I'm closing this ticket.