Before the new formatting:
Now (red circle shows the extra space):
I don't know if this extra space is intentional, but it is annoying. I keep thinking "there's unwanted space there, let's fix that code block".
It is also confusing, at least in some sites, such as Code Golf and Coding Challenges. In that site, code typically needs to be as short as possible, and specialized programming languages are often used in which a space character can be much more meaningful than in normal languages. For example, in the images shown above, one would now think that the code has 5 bytes (not the claimed 4), with an initial space character.
The whitespace before the new formatting was tiny enough that it wasn't confused with an actual space character. Can we revert to that?