Local modifications in custom dimensions do not persist after uploading to Realms

I built a few maps with friends in the overworld on my realms server, but I've decided to move them to their own dimensions. I used the WorldEdit mod on a downloaded copy of the world to move the maps to the other dimensions. This process was successful and I was able to visit each dimension and see the maps locally, so I decided to upload the world to realms. After uploading I visited each dimension to find that the maps I copied are missing.

I did an additional test by adding a single block to one of the custom dimensions on a local copy of the world. After uploading that world, the single block I added was missing.

I just want to modify the dimensions chucks locally and upload them to realms, but Realms doesn't appear to be tracking these changes.