How to make WordPress show widgets in the admin area?

Question

PHP

The old style of widgets is included, on the new block style the same problem.
Widgets in the admin panel are visible on the local copy.
On the server, no.
The local copy had a different domain name.
I changed the domain to a new one by replacing it in the database using phpMyAdmin.
I realized that there is a problem in serialization.
I did serialization through Better Search Replace, first replacing it with http, then with https. Therefore, wherever there is a domain name, there is serialization.
.

WP adds widgets in CSS admin display: none !important;
At the same time, everything on the front works.

I tried disabling all plugins and changing the theme to the standard one. No result.

How to make WordPress show widgets in the admin area?