The web UI has some weird rendering bugs that were introduced with the last reskin. For example, at certain zoom levels highway ramps disappear so the highways look disconnected.

Edit: as an example, look at https://www.google.com/maps/@43.6264803,-79.321245,11.34z The highway labelled "427" on the left looks disconnected from the "Gardiner Expwy" until you zoom in further. I expect basic details like this to work.