The notifications were nagging me about some ruins that drove me crazy until I finally decided to erase stuff just to see what's happening, because I couldn't see any ruins mark. This is how I found that the ruins were in fact a road or a bridge.
See video: https://we.tl/t-CHRSppMncT: (https://we.tl/t-CHRSppMncT)
Update: Shared on YouTube: