Transitions fail to load built-in sprite graphics on HTML5 target

[JesseTG]

On desktop, transitions work exactly as I would expect them to.

However, on web browsers, I get this:

Looking at the image cache, the transition tile sprites are loaded.

All of my states extend FlxTransitionableState, and the code that specifies transition behavior is as follows:

FlxTransitionableState.defaultTransIn = new TransitionData().init(
  color = 0xFFFFFFFF,
  type = TransitionType.TILES,
  direction = FlxPoint.get(1, 1),
  duration = 0.25
);

FlxTransitionableState.defaultTransOut = FlxTransitionableState.defaultTransIn;

Other potentially useful information:

• There are no error messages
• Dead code elimination doesn't seem to be the culprit

[Gama11]

The culprit is openfl/openfl#682.