Not an error-creating bug, but still an obvious mistake. Inside sector XT-26 the location of portals to XT-23 and XT-93 are swapped by mistake.

If you look at global map, XT-93 is northeast from XT-26, and XT-23 is southwest from XT-26. However, inside XT-26 the location of these portals is the wrong way around - XT-93 portal is in southwest instead of northeast, and XT-23 portal is northeast instead of southwest.