Imported transparent PNG and PSD files have random feint white lines around edges

Since the latest Adobe Illustrator update, I am seeing random feint white lines around imported photoshop transparent PNG and PSD files, into Illustrator.

• The lines do not appear on the photoshop file, tested with various colour backgrounds.
• The PNG files are exported in high res, the Illustrator raster settings are at 500dpi (and tried 300dpi). The PNG export settings are "bicubic smoother" and I tested all other options (although historically, I always use the bicubic smoother setting with no issue).
• I've tried rasterising the images, and flattening to the background colour, lines remain.
• Upon exporting to PDF, or importing into InDesign, the lines are retained.
• Like the Adobe Acrobat line phenomenon, the keylines (in Illustrator) do change a little as you enlarge or reduce the scale on the screen.

This will be a digital online catalogue, as well as being printed, so I need these keylines gone. 

I suspect it is a bug.

Same candle, with navy background out of Photoshop - no white lines:

Thanks.