Opponent has "Confounding Conundrum" in play, I play a land then cast and cascade with "Imoti, Celebrant of Bounty" into "follow the tracks" which I cast. This conjures a land into play triggering Conundrum so I select "Tranquil Thicket" to return to my hand but nothing happens. Then, next turn, the "Tranquil Thicket" that should have returned to my hand does not untap and is still in play.

I've attached the Log File.