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I have first attended and then unattended to an event. In the stream message my name appear when i attend and after unattending my name was removed from the message.
This is ok for me.
After that, i attend again to the same event and and then my name was not posted the the stream. There is "bluesmarc" instead of my name and only 2 others are posted (first screenshot). As you can see in second screenshot, when i click on the "2 others"-Link i get a detail window in which "bluesmarc" appears again. But my user "Wuegi" is not visible here.
In screenshot 3 you see that there are 4 users attended to the event and my user "Wuegi" is one of them.
But i'm away for the next 4 weeks. So unfortunatly, i can't help you anymore with tests. If it's ok for you, i will check if the issue still exists and i will contact you when i'm back. ;-)