Using a compiled (mbc) wrapping trait: Cannot invoke this object (REPR: Null, cs = 0)

gistfile1.txt

cdc:~/golf$ cat lib/Golf.pm6

unit module Golf;

multi sub trait_mod:<is>(Routine $routine, :$wrapped!) {
	$routine.wrap: -> |args { callwith(|args) }
}

sub foo is export is wrapped { ... }

cdc:~/golf$ panda-build
Compiling lib/Golf.pm6 to mbc

cdc:~/golf$ PERL6LIB=$PWD/blib/lib perl6 -e 'use Golf; puts("OK")'
Cannot invoke this object (REPR: Null, cs = 0)
  in block  at lib/Golf.pm6:7
  in any enter at src/gen/m-Metamodel.nqp:3560

cdc:~/golf$ PERL6LIB=$PWD/lib perl6 -e 'use Golf; puts("OK")'
OK