When creating a world, in More Advanced Options -> Import Settings, no JSON file seems to be accepted, including world data exported from a world of the same version.

 

After selecting a JSON file, an error appears on the top right of the screen as a notification:

Error importing settings

Can't load registry with this ops

 

The contents of the JSON file I tried to import:

{
  "bonus_chest": false,
  "dimensions": {
    "minecraft:the_nether": {
      "type": "minecraft:the_nether",
      "generator": {
        "biome_source":

{           "preset": "minecraft:nether",           "type": "minecraft:multi_noise"         }

,
        "settings": "minecraft:nether",
        "type": "minecraft:noise"
      }
    },
    "minecraft:overworld": {
      "type": "minecraft:overworld",
      "generator": {
        "biome_source":

{           "preset": "minecraft:overworld",           "type": "minecraft:multi_noise"         }

,
        "settings": "minecraft:overworld",
        "type": "minecraft:noise"
      }
    },
    "minecraft:the_end": {
      "type": "minecraft:the_end",
      "generator": {
        "biome_source":

{           "type": "minecraft:the_end"         }

,
        "settings": "minecraft:end",
        "type": "minecraft:noise"
      }
    }
  },
  "seed": 2767297914453952139,
  "generate_features": true
}