This occured on the IOS client.

Opponent played Enduring Curiosity on their turn. I tried to target it with the Kaito planeswalkers’ -2, but it would not let me target. Then, I played Floodpits Drowner, which requires to select an opponent’s creature so the creature was tapped and had a stun counter on it.

On my screen, the creature did not tap and did not show any counter even though it was tapped, since the creature was unable to block my Kaito and it skipped through their combat.

Two turns later, the stun counter came off of the Enduring Curiosity, and my opponent attacked with it. Once again, the creature did not tap. The game proceded to the declare blockers step. I was able to select my creatures to block, but could not click or interact with the Enduring Curiosity to block.

In the same game, I was able to interact with other creatures on the field the entire time, before and after the Enduring Curiosity. This is a gamebreaking bug, and doesn’t give me confidence in playing events on Arena where I could lose because the client gives an unfair advantage to one player. Please fix.