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Describe the Bug:
AI pinged with Thornweed faeries my River Boa enchanted with Mortal Wound and I didn't have the opportunity to regenerate it although I had more than enough mana.

Which card did behave improperly?
Mortal Wound

Which update are you using? (date, name)Which type? (duel, gauntlet, sealed deck)
Manalink 2016/08/27: Eldritch Moon v2, duel

What exactly should be the correct behavior/interaction?
Mortal Wound doesn't prevent regeneration.

Are any other cards possibly affected by this bug?
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Regeneration effects don't trigger same happened with Albino Troll but regeneration effects did trigger with a Regenerate and with it I could regenerate the creature.