If you cover the floor of your mine with torches you can't enter it anymore!

I was actually trying to test to see if anything horrible happened if ore couldn't spawn, but what I stumbled upon, was if you cover the space in front of the mine entrance with torches, you will be forced back out of the mine immediately upon entering. Presumably because the game can't find a place to put you, as all of the nearby blocks are "occupied", obviously torches shouldn't count for that though.

No sane person would ever do this, but nonetheless, feel it warranted a report.