Automatic update problem

Hello everyone,
A surprising problem happens to me.
I have to use an old website under Typolight and upgrade to the latest version and maintain it.

To prevent any problem I made a copy.
With the copy I made ??a manual update to version 3.0.6 (at this time it was the latest version) whithout major problem.
Recemtly I decided to upgrade the production site via liveupdate after purchasing a key.

The update runs perfectly except that the site does not display any content. I have the template but no text.
I have deleted the cache and generated it after.
When I create a new website whith the site structure module (new root), create a new page under the new root content as home on this page, publishes it while selecting a v3 default template ... I have exactly the same problem.

In the back Office, everything seems to be correct. I have all the elements.

Does it speak to you?

thank you

PP