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I contacted them as you said. The solution they provided is:

Cura implements too much retraction in the end Gcode, which causes the heated filament to clogg the nozzle.

This code has to be changed:

G1 Z+0.5 E-5 X-20 Y-20 F{travel_speed}

If the segment E-5 is removed, there will be no extra retraction and so the nozzle should not get clogged.

I am going to test this on my next print and see if this is indeed the solution