While datapack/data/namespace/advancements, loot_tables, recipes, structures, tags and worldgen/noise_settings are named plural, dimension, dimension_type and all sub-folders in worldgen except noise_settings are named singular.
With the exception of processor_list, which should not be plural.
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However, we are already tracking this issue, and this report is a Duplicate of MC-188816, which has been marked as Invalid - this issue does not meet the criteria of the bug tracker, please check the parent report for more information on why this is the case.
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