Boats fall through blocks when placed near the side of a block

Updated description by [Mod] GoldenHelmet

Steps to reproduce

1. Place 2 solid blocks, one diagonally up from the other.
2. Place a boat on the lower block while pointing the crosshair within about 1/4 block width of the edge nearest the upper block.

Expected result

The boat rests on the lower block.

Actual result

The boat falls through the lower block.

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Original summary
Boats can be placed inside blocks
Original description
Hey Mojang,

There is a boat glitch that lets you place boats inside blocks. When you place it next to a cactus the boat will go into the block that is under it. The video shows what I mean. And the boats can be placed two times when you click only once and the video shows that to.

Please fix it!

Thank you!

Edit: I couldn't put the vid on... but you have to place the boat 2 pixels away from the cactus.