Tower Mission- Codex Don't Stay Stunned

[zechstyr]

I was running a Tower mission where I ended my turn by the terminal. Next turn I activated the terminal, everything stunned as intended, then I ran up the ladder to the rooftop (where two codexes + muton centurion were).

Upon ending my turn, the codexes immediately came out of stunlock. The first teleported and hit my soldier with a Malfunction rift. The second did a normal move and entered Overwatch, resulting in my soldier taking a light hit. After that they generally gave me living hell, though I was able to win.

[Pinguinator]

The same issue I had still with 1.4
I need to restart this level three times, until I could complete it.

[zechstyr]

Apologies, I posted this last night while tired. This was 1.5, PC, a ton of cosmetic mods/perfect info/extra icons/metal over flesh. If needed I can provide a save as well as video documentation.