I can go through any block that is two blocks high from the level I am in, for example if I am on layer 64 and there is a block on layer 66 without a block in between I can get through it without any problem.
Be it a block of stone, earth or wood, as well as chests, pistons and bells.
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Do you have the Elytra equipped?
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I do not have the elytra equipped.

Thank you for your report!
We're tracking this issue in MCPE-109925, so this ticket is being resolved and linked as a duplicate.
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