Wukong loses invisibility on W cast.

This has been going on for a while now, and it hasn't been addressed (to my knowledge, because it just happened again). It happened to me twice recently.

Occasionally when you W as Wukong, you don't go invisible. You just don't. From what I've noticed, it happens when I use my combo in quick succession, then W out. However I'm using my full combo and THEN using W. I am not casting or attacking, or doing anything that should break stealth. This has happened in multiple games against multiple people who don't have any revealing mechanics.

Not sure what the issue is, and I know Wukong has a small player base, but this makes it REALLY hard to play him in tons of scenarios.