I got an answer to the feedback ticket with the tip in the config in the ETS2 folder to set the line g_traffic to 0. This line was on 3 for me even though I had set everything to 0 beforehand. Why this line was changed back to 3 remains a mystery. For now the problem would be eliminated the only question now is how long the setting remains. This would end the topic for the time being and the article can be closed.
Thanks also for the numerous answers that might be useful to other users for the same problem.