What are these "puddles"?

I hope I use the right tag or flair for this post.

This is on the Legacy Collection re-release game.

These puddles appeared out of nowhere on my lot and they weren't there the last time I played. I can't pick them up with the moveobjects cheat and they can get covered with snow during winter.

I don't know how to get rid of them or what they are. 🙈🤔