Cards with Transform (Standard and Legacy) Cause Soft Lock when Mutated [Investigating]

Magic: The Gathering - Puzzle Quest MtGPQ Bugs & Technical Issues
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I noticed this in the Colossal Tussle when mutating Startled Awake.
The game would freeze on flip.

I can recreate this fairly easily in Legacy TG with 3 werewolves and a mutate critter.
Here’s the proof.