Hello!
A day before Hotfix 35.5.7 dropped, i was doing railjack void storm missions, did 4 spy on veil proxima and later 3 skirmish on veil proxima and not a single corrupted holokey dropped from mission reward. I still had the same amount as i had before doing the void storm missions.
Could this be a bug? I find it highly unlikely for something with 1/3rd drop chance