Weird bug (EXECUTED)

If u trade with enemy champion but towers, minions and monsters get last hit, u dont get the kill(but get gold) and the announcer say "you have slain an enemy" and "exectued" i dont have if this happened in one game(rare bug), but is really weird EDIT: Every game, inst a rare bug EDIT²: Dont have replay to show this(idk why)
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