If I insert datapacks into a world's folder and then play that world, the datapacks don't load. There is no error message in the logs (minecraft-folder/logs/latest.txt), and the Minecraft chat does not give any indications of possible errors. The pack version in pack.mcmeta is correct according to the Minecraft wiki (see Minecraft wiki on pack format).
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That's a datapack that I coded for myself. If I change the pack_format in pack.mcmeta to 22, the Datapack works in Minecraft 1.20.4, so that it seems to has the right syntax. If I try to run "/datapack enable mc_utils_1-21" it says that that Datapack is already active.
The data pack format version for 1.21 is 48. A lot of changes to the internal structure of data packs were made. For example, the functions directory is now called function instead. Same for tags/functions → tags/function.
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We're tracking this issue in MC-273896, so this ticket is being resolved and linked as a duplicate.
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Please attach the datapack you're trying to use and the latest launcher_log.txt after enabling the datapack when creating the world, and after running /datapack enable [datapack_name] ingame