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I'm pretty convinced it's a firefly after watching the video frame by frame. Go to the YT video, set it 1080p and pause at 36s. Then go frame by frame (use ',' and '.' to go back/forth by a single frame) and you can see it appear as a dark blob, that comes down, eventually lighting up, then contrary to your point 3 it actually goes in front of the trees.

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I did go frame by frame myself earlier. The fact that it starts as a dark blob is pretty good evidence for it being a firefly, and I think I saw it earlier as part of the dramatic increase in diameter, but I can't see it that way right now.

For me it's hard to tell whether it "actually" goes in front of or behind the trees. I was thinking if it were bright enough it could fade as it descends behind the treeline. It would be a rather large firefly if it went behind the trees, though.

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