Using V 18.104.22.168, I’m having simple file with some elements:
When exporting the selected elements as a PNG, the antialiasing looks sometimes very wrong/bold.
(above is a zoomed screenshot of the PNG image in Paint.NET)
As you can see, the bottom arrow has a rather nice left side and a horrible unusable right side.
In addition, less obvious, the top arror has a not-so-nice, too dark, right side of opaque pixels, compared to the left side of the top arrow.
My wish is that the anti-aliasing, when exporting, is always correct, no matter where the exported elements are located, relative to each other.
In case it helps, here is an example Lunacy file that I used in the above steps (remove the .ZIP extension after download).