X-Men VS Sentinels (Uncanny X-Men Vol. 3 #1)
Cyclops and Magneto’s powers are still broken and uncontrollable after the events of Avengers VS X-Men. We’d later learn it wasn’t because of the Phoenix powers that caused their powers to malfunction, but the nanobots that infected their body courtesy of Dark Beast.
From – Uncanny X-Men Vol. 3 #1