Sorry to necro but why is this still not pushed as a critical update? I've been converting hundreds of old scanned 8-bit BMP documents into PNGs using Paint.NET over the past 5 months and only now do I learn that all the conversions I've done since around April/May have quality losses in them! Which, by the way, I can't redo since I deleted the originals because I had foolishly assumed that something as basic as saving fully lossless PNGs was a safe and reliable operation for an image editor in 2021.
