Theme not set with Theme::set()

[karneaud]

I'm using the Theme::set function in a Middleware and it doesn't seem to work

Theme::set('angostura'); // Theme::setCurrent();  does not work either
             dd(Theme::getCurrent());

output

null

My environment is

Laravel 5.8
PHP 7.1
Voyager 1.2
Caffeinated Theme v6.1.0