If a trail chamber tries to generate near chunks made in 1.20 andย below it will generate with walled off sections (chunk borders from 1.20 and below) So far after exploring some trail chambers near spawn almost every single one had walled off sections. This should be easy to fix as all yall need to do is not let trail chambers spawn near pre-1.21 chunks, hope this gets fixed soon.
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We're tracking this issue in MCPE-182640, so this ticket is being resolved and linked as a duplicate.
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