Fast fadeBy action doesn't sometimes complete (probably under stress) about excalibur HOT 1 OPEN

var newFadeBy = (actor: ex.Actor, fadeChange: number, durationSeconds: number) => {
  // coroutines start automatically
  ex.coroutine(function* () {
    let duration = durationSeconds * 1000; // milliseconds
    let fadeChangeRate = fadeChange / duration;
    let targetOpacity = actor.graphics.opacity + fadeChange;
    while (duration > 0) {
      const elapsed = yield;
      duration -= elapsed;
      actor.graphics.opacity += fadeChangeRate * elapsed;
    }
    actor.graphics.opacity = targetOpacity;
  });
};

actor.onInitialize = () => {
  newFadeBy(actor, -1.0, 2);
};