There seems to be a weird graphical issue when you draw corridors that across certain spots on the globe. I'm not sure when it was first introduced, but I've noticed it in the past few versions of Cesium and it is still present in the latest version.
This picture will probably describe it better than I can with words:
Here's a sandcastle example where I've drawn a corridor around the entire globe, and you can see that there are two glitches in the line, one around the Pacific and one around the Atlantic: