Holes at Seam location on Outer Perimeter

Hello to everyone, I do have a Problem that I can not get rid of because it is total random on prints/parts.

Sometimes it is there and Sometimes not.

Please take a look at the picture and maybe someone will have an idea what I can try.
I tried everything to get rid of it for what I was finding that is slightly the same problem …and no it is NOT wet filament…
Oh, and the problem seems to be only with petg.

Here is a picture of the same parts just before the above print.