Suspicious blocks have chance to generate on beaches and near river

*The idea that suspicious blocks are exclusive to only a few structures doesn't make sense, because in real life many places have formed and been destroyed over time (leaving only a few artifacts).

*My idea is to allow the generation of suspicious blocks on beaches and near rivers, as small cluster

*Following the reasoning that there was human interaction in that location, which was destroyed over time, leaving only the items. (And humanity has always tended to establish its bases near water

*I also based it on the treasure mechanics of Stardew Valley and Animal Crossing, which is very fun and makes sense to be in the game as well.