No docs on hover when using interpreter line

[naipotato]

Describe the bug
When opening a file with a shebang at the beginning (for example, #!/usr/bin/env -S vala --pkg gtk4), VLS does not seem to be able to display documentation for any of the library symbols whose documentation is obtained from the gir files.

Software
OS and version (e.g. Ubuntu 20.04): Fedora 34 (Silverblue)
Code editor (e.g. VSCode): VS Code 1.56.2
Vala Language Server (e.g. git commit, or PPA/AUR version): RPM 0.48.2
Vala version (valac --version): 0.48.17

To Reproduce

#!/usr/bin/env -S vala --pkg gtk4

void main () {
  var asd = new Gtk.AboutDialog ();
}

Steps to reproduce the behavior:

1. Hover the Gtk.AboutDialog symbol
2. You get the declaration of the class, but no docs