YunoHost package version is "6.0.2~ynh2" but wordpress site is still "5.8.6"

Describe the bug

YunoHost package has been upgraded to latest version 6 but wordpress site is still in version 5.8. I tried to "force upgrade" the app to try "iron out" the configuration but it didn't work.

=> Ticket name could be "force upgrade" does not work

Context

Hardware: kimsufi dedicated server
YunoHost version: 11.0.10.2
I have access to my server: Through SSH and hrough the webadmin
Are you in a special context or did you perform some particular tweaking on your YunoHost instance?: yes
- If yes, please explain: I tried the patch version to fix the uploads / permission issue
If upgrading, current package version: 6.0.2~ynh2

other infos

The site was created by using the plugin All-in-One WP Migration to clone an existing wordpress if it can help :
Installing a new wordpress from scratch shows the right version: 6.0.2

Steps to reproduce

check the current wordpress version with

~# grep wp_version /var/www/wordpress/wp-includes/version.php
 * @global string $wp_version
 $wp_version = '5.8.6';

check current wordpress package version

~# yunohost app list
    [...]
    description: Create a beautiful blog or website easily
    domain_path: maindomain.tld/echanges
    id: wordpress
    name: WordPress
    version: 6.0.2~ynh2

Force an app upgrade with

~# sudo yunohost app upgrade wordpress -u https://github.com/YunoHost-Apps/wordpress_ynh --debug --force

check again the current wordpress version with

~# grep wp_version /var/www/wordpress/wp-includes/version.php
 * @global string $wp_version
 $wp_version = '5.8.6';

=> wordpress still in version 5.8.6

Expected behavior

Wordpress should be in version 6.

Logs

I only have the logs for the "force upgrade", not the original upgrade in the yunohost history (5.8 => 6)

https://paste.yunohost.org/gadixuheri.bash

YunoHost-Apps / wordpress_ynh