While playing as ETC I had a golden Elementium Squirrel Bomb & plain Titus Rivendare; the enemy had a Drakkari Enchanter without any buffs & two 200+ stat mechs. When the Elementium Squirrel Bomb’s deathrattle triggered it struck the Drakkari enchanter with every bomb, even while it had 0 health and the other two minions remained untouched.
As far as I am aware once a minion hits zero it shouldn’t continue to be hit by the deathrattle, but feel free to correct me; even if that were the case the odds of one of three minions being the only one targeted when there were so many procs makes this seem like something may be going awry.