On 5 July 2021 prop explained how to reach the nether roof: not by breaking bedrock, but by glitching through it, then building a portal up there 1 2. IRIS suggested powdered snow, which prop shot down because it does not exist in 1.16.5 3.
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we have to glitchourselves thru the nether roof
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then build a portal up there
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powdered snow is not ther in 1.16.5
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i just glitch thru