Underrealm Lich's Prevent Damage clause bug

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If we apply the same logic as Razia, Boros Archangel's Prevent Damage, then Underrealm Lich should get it's Prevent Damage at the same timing. Just tested it out but Underreal Lich's Prevent Damage comes back on turn 5 (essentially it loses Prevent Damage for 4 turns);

Turn 1 (your turn) - Underrealm Lich Prevent damage triggers, loses prevent damage
Turn 2 (opponent's turn) - No prevent damage
Turn 3 (your turn) - Still no prevent damage
Turn 4 (opponent's turn) - Still no prevent damage
Turn 5 (your turn) - Finally prevent damage is back

Razia, Boros Archangel discussion; https://forums.d3go.com/discussion/78969/razia-boros-archangel-prevent-damage-investigating/p1?new=1