[BUG] 2048: Spawn new tile without any valid movements

[IndieCoderMM]

Describe the bug
Any key press spawns a new tile without any movement (sliding/merging) of existing tiles.
This allows the player to magically create a new tile which makes the game a lot easier.

Screenshot
It's not obvious but you can see the bug in this gameplay.

Expected behavior
In the original game, a new tile is only spawned after a valid movement.
e.g., In this position, only UP & LEFT keys can spawn a new tile.

Additional context
I'm not sure if this is intentional or not.

[Kaamkiya]

Right, this bug is documented in the code but I forgot to make an issue for it.

I have an idea on how to fix this, but it might take me a little while.

It's not intentional.