Hi am building a glass tower and i set my home on the top layer i had built and kept building i later left and returned /home and i was in the glass blocks and could walk around in them here are some screenies.

k.

probably because you set your home, then kept building.. Not really a glitch, just get to the glass tower some other way, and then reset your home, not ontop of the glass, but somewhere you won't build around/on.