Graves slow from his W is not removed by Mikaels, and it does not count as a successful cleanse and therefore does not give the slow immunity and speed boost it should.
• Reproduction steps: Mikaels a champion stood inside Graves W smokescreen
• Expected result: The champion should be cleansed of the slow, gain movespeed and become slow immune
• Observed result: The cleanse fails and there is no slow immunity
• Reproduction rate: 100%
(Have tried it now against Cassiopeias grounding effect, the mikaels successfully cleansed the show and gave the speed boost and slow immunity, I can’t try it on Singed he’s not available in practice tool, so as far as I’m aware it’s only Graves W that is the issue)