I have network that I use for analysises with Service Layers. Some service layer polygons are smaller than the default breaks I set up. Using the network identify tool I saw that the edges yielding the smaller polygones are not properly connected. The screenshot shows an exmple: the endpoint of edge 118329 (the red one) is snapped to a vertex (small white rectangle) of the edge that should be adjacent (turquoise). There is also a Network Dataset Junction on both endpoints of the red edge. However there is no junction at the turquoise edge feature.
I tried rebuilding the network with "any vertex" in the connectivity but the two edges are within the same connectivity group anyway.