Bug - Footage scaled up to comp size adds a thin semi-transparent edge to entire comp
If I place a half-res clip in the comp and scale it up to 200% to fit the comp, for some reason this makes the border of the entire comp slightly transparent. I can see just a little bit of the grid through the edge, and this also appears in the alpha channel if I view that.
This only happens when the footage size exactly matches the comp. If I modify the scale, it goes away.
Importantly, this still happens when other layers are below, so it's not just a matter of not filling the frame, the layer is somehow also breaking the alpha for the entire comp. In my screenshot, I have a solid behind the layer. When the layer is on, I get the transparent border. When I turn the scaled layer off, the border goes away.