Playing a game of DOTA, went to my profile to try to find the people that I played with last so I could commend and noticed Nyx was transparent.

Have Nyx (On your team and your featured hero) go in Vendetta, and check profile. If you're still in the game and Nyx falls out of Vendetta, the effect fades from the featured hero.

If you leave the game while Vendetta is active Nyx stays perma-transparent until you possibly join a new game or rejoin the old.

Note: Repeatable with Ethereal Blade as well.

Other people do not see the glitch, just the player who just finished a game with Nyx in this state.