Just found this:
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The (at least) desktop version of ADE will not display PNGs correctly that have a bit depth less than 8. They instead look very strange, like a linescreen has been applied to them.
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Source 1
Also this:
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reduced-color png brings us back to square one ---- the ADE engine in some devices can not properly render 2-bit (2-colors) or 4-bit (16 colors).
So it looks like being stuck with either 8-bit 256-color png with its larger file-size, or with crushed jpegs in 256-greyscale, smaller files but compression artifacts.
But the 256->16->256 png makes a pretty small file, so probably would be the way to go with images with low color count.
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Source 2
But my PNGs are already 8-bit, so I don't quite get what is happening.
Usually the disappearing pixels are on an extreme of the dynamic range (either the brightest or the darkest), but sometimes it is not the case. I observed, though, that low-contrast PNGs almost don't suffer this, so I'll see if reducing the color range solves anything.