Your home or bed is NOT missing or obstructed, but let's chuck you back to the world spawn anyway!

Simply put, the game's bed based respawn system seems (seems) to be completely and totally non-functional at the moment. I make a bed. I place it in a room. Surrounding the bed is a 2x3 wide section of empty air, with solid walls all around, a solid floor underneath and the bed in the center. I sleep in the bed. Come morning, I throw myself in a nearby lake and drown. And BOOM! Back to the world spawn, with the game helpfully telling me that my home or bed is missing or obstructed.

I try other things. I try removing the floor. Nothing. I try adding torches. Nothing. Wider room? Nope. Door? Nada. No door? No dice. Only time I'm able to control my spawn is once, when my bed is on a floor below where I ended up respawning, and I respawn on a block of nether sand, directly above where my bed was, in a small enclosure surrounded by glass on all sides, with the exception of having a solid roof. What? Why on earth is THAT where I respawned? My bed wasn't even in there!