hoisting behavior changed between chrome 48 and 49 ?

if (true) {
  function test() {
    console.log(true);
  }
} else {
  function test() {
    console.log(false);
  }
}

test()

Chrome 48 (and node <5.9.1) logs false, chrome 49 (and firefox) log true. I guess they optimized by not hoisting from the falsy branch, but that can break existing applications.
Which one is correct according to spec?