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This somewhat relates to MCPE-10858 but I think it's not the same. Here's my hypothesis:
- The portal finding algorithm first searched for an existing active portal in the corresponding area of Nether. Since it was a new world, no such portal existed.
- The game then searched for a valid location for creating a portal, i.e. 3×4 solid blocks with air 4 high above all 12 blocks, according to the wiki. Unfortunately that failed too, because there was nothing but air and lava in the target chunk.
- In this case the algorithm was supposed to create a 2×3 platform of obsidian with air 3 high above at the target location. However in reality, it simply gave up creating anything and then spawned you in the air.
- Since you were spawned in an invalid location, the game teleported you onto the next available platform in Nether just like
MCPE-10858.
- The said platform was the bedrock layer so you were screwed.
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