The ceilings of the new basalt deltas biome are made from netherrack and not from Basalt, unlike in java edition.
Steps to reproduce:
1.Enter the nether on a new world
2.Locate a basalt deltas biome
3.Look at the ceiling and observe it is made of netherrack and not basalt as it should.
We're tracking this issue as MCPE-79608, so this ticket is being resolved and linked as a duplicate.
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