This has not happened before but in my last game on 9/1/21 at ~2:10 pm EST, I had 3 counters on my Runaway Steam-Kin. I was holding a Wizard Lightning. The game did not give me priority to remove the counters and cast Wizard Lightning. It cycled to my opponents' turn instead and wouldn't let me remove the counters for 3 mana to cast the spell.