After Caves and Cliffs Part 2 released, this would add new terrain below existing chunks. After 1.19 came out, taking a pre-1.18 world and then upgrading it would spawn ancient cities below those chunks, despite not existing in 1.18. For some reason, this does not apply to the trial chambers. I myself have a world from 1.17 that I’d like to upgrade to modern versions but this bug is preventing me from doing so. This can be replicated by loading any world in 1.17.1, then upgrading to 1.21 or above, and going to find a trial chamber. They will fail to generate if they are in a “old chunk”, despite being below y-0 like ancient cities.
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