[perl #64824] .parse on a Grammar doesn't seem to bind in actions in Rakudo

[Carl Mäsak via RT]

<baest> rakudo: grammar A { regex TOP { <foo>  }; regex foo { foo {*}
}}; class Act { method foo($/) { say "OH HAI" } }; A.parse("foo",
:action(Act));
<p6eval> rakudo a58fce: OUTPUT«OH HAI␤»
* masak disqualifies rakudobug
* masak hangs head in shame