Okay, so more updates: not only did the plugin broke WordPress installation, it also broke the database of my host provider (serious paid host provider with 100 thousands of clients). As such, it is not even possible to reinstall the site from my Duplicator backup, because reinstallation needs connection to database.
This must be the most destructive plugin I have encountered in my entire programming career.
The plugin is unable to load the install files since it doesn’t accept a self-signed certificate. Nevertheless, I deactivated all plugins manually and the problem seemed to disappear. So now I am going to narrow down the responsible plugin. I will let you know when I find the culprit.
Hi,
and do you know if there is a ticket on this on some repository which progress can be observed?