I've started printing a new TPU mount in S3D recently which has a strange artifact on it - it's like the printer decided to add a wall to the geometry that links one corner to the other.
At first I thought this was a retraction issue, but watching the printer in action it actually moves at feeding speed, not travel speed, like it's intentionally doing it. From the pictures you can see the added wall is actually quite well printed, it doesn't look like it doesn't belong there.
So I looked at the preview in S3D only to find there were no trajectories that crossed that space, and no travels either, it's not supposed to cross the inner boundary at all. Then I looked at the exact line in the preview of the GCode and where the toolhead is supposed to be, it looks like the two positions in question are X113.292 Y89.466 and X112.764 Y121.067, and for some reason it traverses them for several layers instead of printing the outline.
I tried the print on it's own, and in multiples and the issue is repeatable, I have no idea why this is happening now and I need some help. What's also notable is the printer ignores 'pausing' commands through it's physical interface when printing these layers, although that may be coincidence. What could be causing this weird behaviour? I've included a GIF of the finished workpiece, my STL file, the profiles I used (TPU being the one in question) and the GCode I inspected.