Minecraft nether reactor is not working?

So I created a nether reactor in Minecraft Pe 0.9.5, and so I tapped it and it took me into a room made with walls of netherrack, and little items popped up from the floor and I picked them all up. Next, my reactor turned to obsidian. But something weird happened next… The walls started to break and outside of the room it was just the normal overworld. I don't understand, where's the nether? Where's the ghasts? The lava? The giant cliffs?

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