Hi and thanks for replying to my question. And welcoming me. And sorry for not introducing myself properly - it was late and I was frustrated, if that's any excuse :-)
I just started with Affinity Designer and I had this problem right from the beginning. before I updated to the latest version it happended with every single stroke, now it happens frequently, but not with every stroke.
As adviced I captured it on video (thanks for the recommendation of OBS):
Please have a look at
00:29 (here the artefact is seen in preview, but when I release, it is gone. But the line thickness is not what it should be - I start with a lot of pressure, releasing it)
01:07 (artefact and zoom-in on what it looks like)
The video is 4 MB, I hope that is ok. If not, let me know and I will have to look into how I can reduce the file size. I have not done video editing before on my computer (i.e. no clue and no software, probably), so that's why here is the lazy version.
It looked to me like the initial max pressure was not transmitted and then there was a very abrupt change in line thickness when this pressure was transmitted, leading to this artefacts. You can see when I move the handles, that it is just a really abrupt change in thickness. I thought I will just try to delete the first node. My reasoning was, that if it is a problem with the pressure not being correctly detected / translated / whatever for the first node, but then being ok for the second, that should remove the artefacts. However, the artefact is following to the second node, if I do this.
Thanks for taking your time to read this, it is appreciated