The center of the puddles that spawn in monsoon season persist after the season ends, and are treated as shore. During the day, there is nothing, but at dusk, they appear as five-square puddles (4 surrounding the originating square) and grow as the night deepens, then receding at dawn. The puddles don't encroach on wood flooring, though.
This has only happened since the latest patch on PS4 (the one around 3/18/17), and has only been a problem after experiencing the first monsoon season.
Steps to Reproduce
Start world using patch 1.08 on PS4, survive past the end of monsoon season, watch at dusk.
This issue has not been confirmed by a developer yet.