Paths spritesheet Explanation

I want to create my custom map but in Tiled there are some Paths.png sprites that are not yet explained on the wiki. This is the link:https://stardewvalleywiki.com/File:PathsExplanation.png. This picture is outdated. Can someone please explain what the new Paths.png sprites mean?

 

I don't know what the wavy one and the skull-looking one are, but according to this reddit post, the last 2 (indices 29 & 30) relate to where the game will automatically place cabins when choosing that option on starting a new multiplayer file.

EDIT: OK, found references to the other two in StardewValley.GameLocation.loadObjects(). The wavy one (index 27) adds a "BrookSounds" map property and the skull (index 28) identifies the grub locations in the Mutant Bug Lair.

Code:

case 27:
    this.changeMapProperties("BrookSounds", string.Concat(new object[]
    {
        tile.X,
        " ",
        tile.Y,
        " 0"
    }));
    break;
case 28:
{
    string a = this.name;
    if (a == "BugLand")
    {
        this.characters.Add(new Grub(new Vector2(tile.X * 64f, tile.Y * 64f), true));
    }
    break;
}
case 29:
case 30:
    if (Game1.startingCabins > 0)
    {
        PropertyValue pv = null;
        t.Properties.TryGetValue("Order", out pv);
        if (pv != null && int.Parse(pv.ToString()) <= Game1.startingCabins && ((t.TileIndex == 29 && !Game1.cabinsSeparate) || (t.TileIndex == 30 && Game1.cabinsSeparate)))
        {
            startingCabins.Add(tile);
        }
    }
    break;
}