When using the command "/weather rain" in a json file customized dimension, no rain is produced. However, when teleporting to the overworld, typing "/weather rain" in the overworld does work. After rain has been produced, I can teleport to the custom dimension and it will also be raining/snowing in that dimension. "/weather clear" does work in the dimension but "/weather rain" will not work.
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We're tracking this issue in MC-186626, so this ticket is being resolved and linked as a duplicate.
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