There's something funny going on here. I just checked, and the OP is right. "Save As" PNG no longer embeds the profile. And there's no way to check the box in the Save dialog.
Save For Web and Export both embed the profile correctly - if you remember to check the box. But once you do, it sticks for the future.
It used to be the other way round - you couldn't use SFW if you wanted to embed the profile, you had to use Save As.
This has to be "collateral damage", they must have done something and accidentally broke this in the process. Luckily, Export/SFW is a fairly natural choice for PNG saving. I'll stick to that until they get this sorted.
I agree, D, the Save As behavior looks like a bug, though Adobe has made some changes to the way PNG conversions are handled in recent versions.
Re: the Export features, stay away from Quick Export as it appears not to embed the profile (nor is there an option in Export Preferences). Yes, stick with Export As (finally debugged in 2018, but not recommended in earlier versions), or the tried and true Save for Web.
Hi D, hi Steve - thank you both for your replies - it works, is not the simple way like "save as" but it works.
Work is done and we can deliever on monday.
It´s a bug, but a crazy one - using "save as" in bridge the png ist shown with the right tag in the meta - but with crazy colors. On "exporting as" it works fine.
Have a nice weekend! Christian