Using Teleport with Ferren Cloudwisp makes its sprite disappear. I'd like to know if this is specific to Cloudwisp (or some specific mechanic in the match) so if anyone finds a similar bug, please say it.
I can confirm that this is not only not just happening with Cloudwisp (it happened with my Goblin Spellkaiser as well) it is also happening with the ability Shadow Shift as well. Could be worth checking other teleport-esque abilities.