Server "Remembering" Deleted Datapack Dimension?

So this is a weird one. I've been trying to set up an extra "mining dimension" on my NeoForge 1.21 server with plans on wiping/resetting that dimension every week to keep the size of the "main" overworld dimension reasonable.

To do this, I went and made a datapack following the advice on the wiki (https://minecraft.wiki/w/Tutorial:Adding_a_new_dimension)

The dimension works, I'm able to teleport to it/etc. - that part is doing what I want.

However, when testing the whole "wiping it weekly" bit (which will be done manually), I went and deleted the folder ./root/world/dimensions/my_dimension

While this did cause the dimension to regenerate, it's the exact same seed, which isn't what I want. So I went in and added a "seed" entry to the datapack's *.json file. However, that didn't change anything on the next wipe attempt.

So I duplicated the my_dimension.json file and made my_dimension_2.json, and I changed the seed entry. That did create a my_dimension_2 in-game alongside the first one, and that works, but it's the same seed.

Further testing later, I've gone and deleted the datapack entirely from the world/datapacks/ folder, but I'm still able to teleport/regenerate those dimensions as is. So clearly I'm missing something that's saving these settings/etc., but I'm not sure what or where.

FWIW, I stopped/started the server in between all of these changes.

How do I fix this?

Thanks in advance!
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