get_post_types with switch to blog

Hello

I don’t know if anyone else can replicate this problem but I have a function:

global $switched;
switch_to_blog(1);
    print_r(get_post_types( array('public' => true), 'names' ));
restore_current_blog();

but I always only ever get the results for the current blog. Does get_post_types work with switch to blog?

Thank you

James