Northern Roads has an issue with Dyndolod 169 where the solitude bridge will not load in the worldspace: https://postimg.cc/GHTXVP4X.
From what I can tell, this issue is happening because Northern Roads is overriding the vanilla reference of the bridge with a new one in the persistent Tamriel Worldspace which is causing Dyndolod to never load the bridge. When I take the record and move it into a new mod that isn't overriding the vanilla bridge record, it works as expected.
The editor ID of the offending reference is "COTN_SBridge01StoneRoad". Here is a picture of the record along with the hack I used to test: https://postimg.cc/1gfLqjkm
I did test this using just skyrim with only dyndolod/requirements and northern roads but my logs from it were deleted because I wiped that whole instance once I saw the issue wasn't with my modlist(I found the work around in my main list that has 1k+ plugins). If it would be helpful I could find time to recreate it.