post-position `for` loses `when` statement

[mizchi]

i.deactivate() for item in items when not item.isVisible

(() => {
  for (var item in items) {
     i.deactivate();
  }
})()

[eventualbuddha]

This appears to happen regardless of whether the for loop is post-position or not:

for item in items when not item.isVisible
  i.deactivate()

for (let item of items) {
  i.deactivate();
}