World download fails in spite of no add-ons

(I am not a native English speaker, so there may be grammar errors. )

Summary:

I can’t download my world from Realms. An error message saying “An error occurred” is displayed.

My world is 1.4 GB in size, and no add-ons are installed.

The error appears as soon as the download progress exceeds 1 GB.
Another world that is 0.08 MB downloads successfully.

I can play on Realms, but I can’t download the world.

I searched for similar reports but couldn’t find the same issue.

Steps to Reproduce the Issue:

① Upload a world exceeding 1 GB to Realms. (I uploaded it on Nov 1st)
② Choose “Edit World” and click “Download World”.
③ Wait until the download progress exceeds 1 GB.

Expected Result:

No errors should occur, and the world should be added to “Worlds”.

Actual Result:

An error message saying “An error occurred” is displayed.
As a result, the world is not added to “Worlds”.

Supplement:

I have a homepage about my Minecraft world, but it doesn’t contain much useful information.
I can provide it if necessary.