Tile doesn't fall all the way

[gruelingpine185]

As shown in the following image, there is a blue L-tile on the bottom right. This is a fully intact tile that I played several moves before ending the game. It was originally going to go above the square like this,

- - - - l
- - - - l
- - - l l 
- - - s s
- - - s s

but it lost its ability to fall upon contact while keeping the ability to move left and right for a little while before locking itself midair. By then, the next tile in the queue was able to be moved around as usual. I'd have expected to be able to move from side to side if in contact with a floor before locking, therefore falling until in contact with a floor. This may be a bug or way the game works (that I've never seen before), but whatever it is, I thought it should be made known.