What are these white spots on my solar panel
I have no idea, but I found this picture of PV cell delamination from a now-defunct website. I think it looks a little bit similar to your case, so it might be delamination of the cell. But you compare the picture to yours and be the judge if it seems similar or not.

If it is indeed delamination, then that is a manufacturing defect.



PS. If the website comes up again, this picture should probably be linked to the original page instead of being re-uploaded here.