1.30.10 has single material problem - requesting change of filament

What is the problem?
My Prusa i3 MK3 stops and asks for change of filament - eventhough I only has one material in the gcode.

What did you already try to solve it?
I am printing the SAME gcode file on the printer from the SD Card - without the use of Octoprint. This works perfectly.

Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware, octoprint.log, serial.log or output on terminal tab, ...)
I'm using a Raspbarry PI 3B+ which - before 1.3.10 update - worked perfect for me.

ONLY change to introduce the problem was the update to 1.3.10.
Now using slic3r 1.41.2+