I set the heli appearance differently which causes the heli not to come in the morning as usual.
But as soon as the night is over I get the GUI Announcement that the patrol heli comes but it doesn't.
Will post this to the Timed Events thread too.

Have you configured Timed Events to announce when the heli is coming?

There is no such option. GUI Announcement does that.

Ok. So my guess is that the heli in the morning is destroyed as soon as it is spawned. GUIAnnouncements listens for when it is spawned then announces it, that's why you're getting the announcement.

I gave your message to the developer of Timed Events.
I don't know if Timed Events works that way that it "kills" the heli when it's time to come by vanilla standard but too early
for the plugin settings.

Yes, I do.

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I just noticed that the that announcement won't come when the night ends normally.
That message only appeared when the players voted the night away with SkipNight UI.

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I also can say that it's not happening with every nightskipping.

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As you see even the Info Panel sees a heli coming but one second later the heli alarm goes off cause there is no heli coming.