Nope, not a known issue. Could you make a screenshot of this?
47 days ago(+1)
This is the lower-left corner of a map, so both of these road segments are looping off-map. I can reproduce the issue pretty consistently by deleting most of the settlements from a large map. The roads get regenerated every time I add or remove a settlement, but once these orphan segments appear it's hard to make them go away entirely.