Search for a translation and translation itself not working

Problem/Motivation

After I added a new language (Italian, for example), in the Drupal translation page (/admin/config/regional/translate), every search term returned empty results instead of the list of translations.

Again, the pre-existent translations not working, all terms stay in English.

My env:

• SQL Server as Database;
• Contrib modules:
• https://www.drupal.org/project/sqlsrv →
• https://www.drupal.org/project/adv_varnish →
• https://www.drupal.org/project/redis →
• Drupal 9
• PHP 8.1

The strange thing: on another env with the same set, the translations work.

Steps to reproduce

1. Add new language;
2. Set the new language as default;
3. Try to search a string or translate a string;
4. The translation is not applied;

Proposed resolution

TBD

Remaining tasks

TBD

User interface changes

TDB

API changes

TDB

Data model changes

TBD

Release notes snippet

TBD