Hello @Dan C
thanks so much for your help. You are amazing! When this issue is fixed, do I need to dowload any app updates or this happens automaticaly?
Meanwhile I have discovered another issue, which might be relevant to this one. (If not relevant here, I can start another thread.)
Im my works I use short line hatching and I use the pressure control (I need an uneven thickness of the lines). Many of the lines appear not solid, but have these white spots at the starting point (shown on the image). When I open the stroke studio, I see a cluster of pressure nodes at the beginning of the line, that indicates pressure dynamic. When I delete some of them, these white spots disappear. But I am not able to do this manualy, since I have hundreds of short strokes im my image.
These white spots appear in every format (on the screen, pixel exports and vector exports). I use iPad and Apple Pencil.
Thanks again for your help!