The “Old Worlds” section of the storage settings used to show worlds from Minecraft: Nintendo Switch Edition (AKA LCE, developped by 4J Studios), but on the newly released Minecraft for Nintendo Switch 2, it only shows worlds from the Bedrock Nintendo Switch 1 version….
Which means I have to open twice Minecraft (Switch 1 then Switch 2 version) and can cause conserns for when sharing the LCE before the user went on their own Switch without owning Minecraft, but still having save data…
In that case, when buying Minecraft for Nintendo Switch 2, there is no method to transfer worlds from LCE to the new version…
Unfortunately, this is intentional.
You will have to import with switch 1 edition first then import to switch 2 edition