Stolen creature dealing damage doesn't count for Enraged objective in RotGP 3.1

starfall

RotGP 3.1

I stole a Majestic Myriarch from my opponent with Mastermind's Acquisition.

Later in the game, that Myriarch, enchanted by an On Serra's Wings, was 21/21, and it blocked a 32/32 Pride Sovereign, dealing 21 damage to it. The battle log recorded the 21 damage, and the Pride Sovereign was 32/11 after the attack.

But that 21 damage was not added to the life counter on the 'Enraged' objective.

Other damage dealt by cards which were owned by me was counted as normal.