Okay, this actually has been around for a while, but this has to be a bug in my opinion. Okay, so if you push a block to the left or right and while pushing the block quickly press down, you can't move until the block is done pushing. It is like there is an invisible wall there when pushing a block. Pushing the block up or down, it is fine, but pushing it left or right, you will get that. It looks really weird and I know it isn't supposed to do that, because what if you were trying to do a timed block puzzle.
Pushing a block oddity
It is a bit of an oddity.
I'm always willing to fix bugs, no matter how old they are.
P.S: diagonal movement enabled?
Yes, diagonal movement is enabled. Also, just tested that, and it looks like you are right, it has to do with the diagonal movement as it didn't do it when I testing it.
Bug fixed!