I’ve done this week’s mutation (Co-ordinated Defense) with Zeratul default (P0) and P3 (Herald of the Void). His Photon canons are not attacking missiles. This isn’t about PDD’s on Nuke intercepting the canon shots - they’re just not firing at any missiles, even the regular ones. Only his Khaydarin Monoliths are auto attacking missiles, which obviously isn’t enough to take them out. Kept losing my base and wondering why my allies aren’t having that problem. Zagara ally’s spores are attacking, Vorazun’s canons are attacking, Swann’s missile turrets - all attack. But not Zera’s canons.
The only way I could shoot them was with my army and target the missiles. Which is one helluva micro-intensive workaround.
I’ve uploaded one of the replays here: https://drop.sc/replay/15900581