fails to detect those communities which are well-separated with densely connected intra-community nodes but only a single inter-community edge with the rest of the network in a simple language
In simpler terms, the detection method fails to identify communities that have strong connections within themselves, but have only one connection to the rest of the network. These communities are well-separated from the rest of the network and have dense connections among their internal nodes. However, the detection method overlooks or misses them.