I've reach the top of nether in bedrock, and i cannot replace block, it should be fair for new gamers to build blocks above b bedrock same as the first mcpe player
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Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-18263.
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That is not a bug. Building above the nether is not yet implemented. Java and Bedrock Edition do not have the exact same features. Please do more research before reporting bugs.