If you enable the option "Coasting", the extruder will follow the extrusion path at the end of switching to the next layer or the next section, but will not deposit any material as it uses the build up pressure in the nozzle to deposit the final bits. This shows up in your G-code representation by empty (non-depositing) gaps (in reality, when fine-tuned correctly, will be filled).
I have had a similar thing happen when slicing a large piece that has - in real life - walls of about 2 cm. By scaling it down to 1.5%, this become less than the wall thickness, and the wall was simply omitted by CURA.
In my experience, a model showing gaps can have in these locations a thickness less than 1 wall.