Lane Violation Question
 

During a foul shot, B1, in the bottom lane space, loses his balance and one of his hands touches inside of the key. He regains his balance and stands back up. The shooter does not notice the player and ends up missing the free throw. Any violation? B1's feet never crossed the foot plane.

9-1-3d stipulates that your example is a violation..."by contacting the court outside the 36-inch by 36-inch space".

This was added about five years ago to answer the very question you've asked, but it does not preclude the fact that the feet crossing the "foot plane", as you call it, is also a violation, as the rule plainly states.

And Case Book 9.1.3 L (c) covers the play you mentioned, ruling that it is a violation.

Thank The Lord ...
 

And thank God for that change, because, before the change, we debated this situation for pages, and pages, of posts.