Maybe you could try it on the testsystem too and compare the behaviour.
I can see that the mail was send in the ticket history. Also in the ticket after each owner change I get an information line:
“Owner changed” -> “agent@mailadress”
Hi again,
Does anybody have an idea how to exclude the notification if you assign a ticket to yourself?
As Owner is used by “owner changed” a can not use the owner again.
As far as I know that´s not possible right now.
And you already got the reason. You have already user “owner” in you trigger and you can use each condition field only once.