Cannot block
I had nine creatures on board and my opponent attacked with their full board of 10+ creatures. Two of my creatures were the same, two copies of wall of forgotten pharaohs. I could block with all my creatures except one of the walls. I tried cancelling and resetting the blockers, but as soon as I blocked with one of the walls, the other could no longer be selected. I'd click on the wall that wasn't blocking and nothing would happen. All my other creatures were single copies of the creature and could block normally. In the screenshot it is the leftmost wall that can't be selected to block.

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M4Kenny#91717 commented
Same thing here still. It also doesnt let me lool at the card when i press/hold it. Its lioe its basically disabled.
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Icequake1#50814 commented
Cannot block creatures with hexproof. This is just one of several issues since adding kaldheim was added. A little playing testing before rushed updates are added. LIke the shuffler issue.
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catwaller#66764 commented
I've had this happen a few times now.
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Metallikyle#10592 commented
I've been running into this also. Very frustrating when it happens.
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Albo#79768 commented
I had a similar situation with an Amonkhet draft:
My opponent had 8 creatures on board and I had 6, I can't block the bigger one a 4/5 Soulstinger and it cost me the game I had a lethal in the back swing if I could block properly. They didn't play any other spell before combat and went for the alpha attack. I try with different creatures with no luck. It was the first creature on the left.
It can be something with the Peacefuld Dog pet I had it as well and the green layout looks bigger than the other pets I ever had.