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Edited
Try "murder", not kill. You won't be pulled into combat for at least a round and that's by design.
I'm sorry you were told wrong. It is by design, because I designed it that way to prevent double rounds, which is an issue that players have complained about for years.
The issue in question is about the player not joining in combat when the pets are targeted first as opposed to when a player is jumped by a pet class.
Which is currently not a bug. The player joins combat a pulse later.