Any datapack folder that has "world" in the foldername's name will be changed.

One of the folders within the datapack folder was named "overworld", after uploaded to Realms it got replaced by "over<My_Realm_Name (world 1)>" causing the datapack to not work.

Summarize: Folders that has "world" in the name gets changed into <My_Realm_Name (world_number)>

You should only make it changing the main world folder's name, not all folders. Thanks!