I was testing the earthquake bug in different scenarios and stumbled upon a strange quirk. If Phoenixes are in the first stack and the bug kills them, then after the attack on their "phantom" stack, they seem to revive and can move and act. However, the game crashes afterward (without HD, I didn't test with it).
I also tested this, but nothing crashed for me (HD+ with SoD_SP). You just need to kill the resurrected Phoenixes one more time, and then they won't revive.