Maokai W-Flash Input Buffer Issues

Issue with input buffering Maokai's W-Flash combo.

When the bug occurs:

1. Issue move command in direction of target champion (this step seems to somehow cause the problem).
2. Press W on out-of-range target.
3. Flash into range of the target.

Expected Result: Maokai instantaneously W's onto target once in range via flash.

Actual Result: The flash causes the W input to be somehow ignored, and Maokai continues his initial move command.

The linked clip shows a challenger top laner testing it in practice tool (I found the bug and gave him some bits to try it himself and confirm it was a bug).