[GAMEPLAY] Fog of War disappearing, but no vision

I had some serious lag issues, and disconnected. When I reconnected, the map had large sections that looked like they were revealed, both on the minimap and the battlefield itself, but they didn't actually have any vision. It wasn't just decaying wards; you can see in the attached images that they were constant over five minutes. Enemy units in the fog would still be hidden, which meant that they would appear to just pop out of nowhere when they left the "revealed" area into a properly warded area. I have a few screenshots showing it on the map, but I forgot to get one showing the issue on the battlefield itself. I've labeled some of the areas that were blatantly "revealed" and didn't have any minions or wards nearby to explain them, but there were other areas that are legitimately warded in both screenshots but even otherwise would lack the fog of war, such as the Baron pit.