The images attached show the problem: The first layer is inconsistent and the extrusion line splits towards the center of the print. Towards the sides, the print lines are better.
The printer is calibrated, the bed is leveled and the latest firmware is installed.
I was thinking it could be a worn extruder gear, but there are no signs of gear slipping.
I have already tried using different temperatures, z heights and flow settings.
Stock Prusa settings also did not fix the issue.
New nozzle also did not help.
The other layers look fine, the last photo shows an xyz cube.
If anyone has a fix to this solution please let me know.
Thank you for your time