Need help identifying and naming the issue with print

[kkurzynowski 0]

Can someone help with the name of the issue causing those bubbles on the hull? This is something I observe consistently on my 3d prints for a while now. I always affects only one side of a model and comes in different shapes for different geometries.   
My printer: Ultimaker S2+ (network, air filter)

Materials: Blue blue models are PLA, White is PETG (both from Ultimaker)

 

** Pleae ignore the white model bottom layer, this is just purely torn adhesion layer, the model is flat and the letters on the bottom are readable. 

Edited April 16, 2023 by kkurzynowski
Avoiding confusion