A duplicant in a jet suit can get into a loop where two identical length paths are "better than each other" and the dupe will rapidly switch between them without being able to take a single step. This "dance" will continue for as long as the paths are of identical length, which can spontaneously stop being true due to dupe going a bit too far in one direction.
I managed to capture it in a save, but since jobs are not saved, it may take a moment to happen. The attached save has a construction job on yellow alert - this job pretty reliably gets this bug. May not be 100% reliable, but I tested it a few times and it happened every time.
I'm pretty sure this bug existed many versions ago, then I stopped seeing it happening, but now it's back.
Steps to Reproduce
Load attached save, track the dupe that will do the yellow alert job
This issue has not been confirmed by a developer yet.