I have some good news to share. I was able to resolve the problem!
It turns out that if the plugins are located on a different hard drive than the one where the operating system is installed, the plugins will not be loaded. Unfortunately, all my plugins were stored on a separate hard drive, which is why I couldn’t understand the problem until I early created the new plugins and saved them on my desktop.
I’m not sure if this behaviour is correct, but the important thing is that I can now load my plugins without any issues.