In uncollected event, last mission, today at 16h37 (Germany), I had to discover two more bugs with Iceman:
After recognizing that some special 1 attacks did not put coldsnap on Ultron (bug #1, I‘m afraid no video is available), I started recording my screen.
Now what I saw was Iceman‘s coldsnap debuff being removed along with other buffs - in this case together with parry/stun debuff (bug #2). Check my video:
https://youtu.be/muXslQq0CyM