WP_Roles data doesn't load correctly when 'switch_to_blog' is called in a multisite.

[syammohanm]

On switch_to_blog call, eventually it will come to get_roles_data method of WP_Roles through switch_blog hook. Then this method checks is_multisite() && $this->site_id != get_current_blog_id(), but $this->site_id != get_current_blog_id() will always be false, because the current blog id is already set in switch_to_blog, hence it fails to load the data.

[jeremyfelt]

Thanks for the ticket, @syammohanm! I haven't taken a close look yet, but I'll add some tags that may help with visibility.

Related: #38645, #36961.