Sure, it affected the gameplay. Depends on your actions whether it restores itself or you get trapped by this bug. I think you can do this two ways.
WAY 1 (Your bust is not yet split):
* Mess around with the bust until you can "illegally" walk over the left (like in picture 1)
* If you've put the bust on the right side, you can "legally" walk over there

* Use Max's power while you're on the far right side in 2D
* Return as 2D Sam in the wrong place!
WAY 2 (your bust is split and you made it to the other side in 3D):
* Use the opening on the far right which unveils an opening below
* Make yourself 2D again
* Click on the newly created opening below while in 2D