Piers cannot be placed on certain tiles in Waterlogged/Salt biome

It's not at all consistent behaviour, with it being possible to place piers all the way up to the trunk of a giant tree, but only in a single lane of tiles, with placing tiles on either side of said line being impossible. Furthermore, there is absolutely no visual indicator to show the difference between these "no pier" tiles and normal shallow water. If this is intentional then the texture of these "different" water tiles should be changed to make it visually clear, since it is currently just confusing.