"Is object on-screen" doesn't work if the object is invisible. Is this intentional? It didn't to that in CC. Kind of makes it difficult to use invisible triggers, enemy spawners, etc. I've worked around it by giving each one an empty second animation frame, but that won't work forever!
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In the code it appears to be intentional - if an object is invisible it doesn't count as on-screen because, well, it's not on the screen.
I've removed that check for the next build, it will count as on-screen even if invisible.