On PC, due to my board state being rather large with multiple additional trigger cards, my timeouts got used up even though i was playing. When this happened, the AI took over to finish out my turn for me as quickly as possible. While digging via Urza's ability to find a counterspell to counter opponent's Farewell, timeout AI again took over, Farewell resolved, and the game did not give me an option to recall Urza to my command zone. It instead left it unsaveable in exile. While i understand that the game can't let me continue playing forever like i technically could IRL, the expected outcome would be to still be given the option to move my commander back to my command zone.