I haven't seen this on the list of confirmed bugs. I decided to give seldom used Katrin the Shieldmaiden card a try, but it turns out it is seriously bugged. When you use her ability to buff your ally for +2 HP and opposing player uses Retreat on that ally, the card will go to your opponent's hand, not yours. This happened when I played vs Amber, she took my Aldon this way and played him on the next turn. The Aldon was not previously stolen from her deck in any way, it was my card.
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