Stringing during travel on first layer with Ultimaker Cura
Yes, if you are using the Combing Mode option, please ensure it doesn't do this in the skin, for a leak/string free first layer, it is required to set the Combing Mode to Not in Skin.



When the mode of the option is set to Not in Skin, combing is "off" for the skin; this implies that the material will retract and move in a straight line to the next print area. When material is retracted (and when properly tuned for your printer), the nozzle will not leak filament causing those (deposited) travel movement lines as indicated by the OP.