Hi Mircea,
below the info as reqeusted.
I am able to create and assign categories for posts and pages correctly and without problems. Also pages that show posts from certain categories show them correctly.
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### Begin System Info ###
-- Site Info
Site URL: https://install.cqbcc.de
Home URL: https://install.cqbcc.de
Multisite: No
-- WordPress Configuration
Version: 6.0.3
Language: de_DE
User Language: de_DE
Permalink Structure: /%year%/%monthnum%/%postname%/
Active Theme: Hueman Pro 1.4.24
Show On Front: posts
ABSPATH: /www/htdocs/w01d47f4/bavarian-contest-club.de/
Table Prefix: Length: 3 Status: Acceptable
WP_DEBUG: Disabled
Memory Limit: 40M
Registered Post Stati: publish, future, draft, pending, private, trash, auto-draft, inherit, request-pending, request-confirmed, request-failed, request-completed
Revisions: Enabled
-- WordPress Uploads/Constants
WP_CONTENT_DIR: /www/htdocs/w01d47f4/bavarian-contest-club.de/wp-content
WP_CONTENT_URL: https://install.cqbcc.de/wp-content
UPLOADS: Not set
wp_uploads_dir() path: /www/htdocs/w01d47f4/bavarian-contest-club.de/wp-content/uploads/2022/11
wp_uploads_dir() url: https://install.cqbcc.de/wp-content/uploads/2022/11
wp_uploads_dir() basedir: /www/htdocs/w01d47f4/bavarian-contest-club.de/wp-content/uploads
wp_uploads_dir() baseurl: https://install.cqbcc.de/wp-content/uploads
-- WordPress Active Plugins
Broken Link Checker: 1.11.18 (needs update - 1.11.19)
Classic Editor: 1.6.2
Classic Widgets: 0.3
EventON: 4.1.2 (needs update - 4.2.1)
NextGEN Gallery: 3.30
NextGEN Plus: 1.12.0
Polylang: 3.2.8
PublishPress Future: 2.7.8
Real Category Management: 4.1.31 (needs update - 4.1.32)
Real Media Library: 4.18.18 (needs update - 4.18.19)
WPCode - Insert Headers, Footers, and Code Snippets: 2.0.3
-- WordPress Inactive Plugins
-- Webserver Configuration
PHP Version: 7.4.30
MySQL Version: 5.5.5
Webserver Info: Apache
-- PHP Configuration
Memory Limit: 256M
Upload Max Size: 200M
Post Max Size: 200M
Upload Max Filesize: 200M
Time Limit: 30
Max Input Vars: 3000
Display Errors: N/A
-- PHP Extensions
cURL: Supported
fsockopen: Supported
SOAP Client: Installed
Suhosin: Not Installed
-- Session Configuration
Session: Disabled
### End System Info ###