PNGs will often export at low resolution unless "high quality display" is selected
I have a graphic which includes a cropped part of a PDF which is a CAD drawing. I select it all, export to a PNG at 600dpi. Put it into Word and when I zoom in it's fairly pixelated: definitely not 600dpi.
If I select the placed PDF, turn the display performance to "High Quality Display" and re-export, it's a beautiful 600dpi file. This screams "bug" to me.
I'll add this to another bug report of mine, which is that if a link is modified or missing, you won't get a warning when exporting a PNG that uses it (you just get the lo-res preview in your graphic).
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Andrewtb333 commented
Further info: the resultant PNG is 600dpi in both cases, it's just that if it's not set to "high quality" the placed PDF component will be the lo-res preview only.