"Replace world" and "Play on Realms" does not work on switch (1.16.1)

Hello,

I have a Realms world that I downloaded locally on my switch, in order to play locally with friends.

I then tried to upload back the world to replace the same realms world, but it does not work.
Same thing if I open my local world and select "Play on Realms"

I get a message like "update finished" (rough translation from original message in french), and immediately afterwards another window displaying "an error occurred".

I have found several same tickets on this issue.

If this is not corrected soon, my Minecraft Realm account is useless and I want a refund.

Thank you for your support.