WP hooks/lifecycle in a custom route

I am aware that custom routes are still in development but I was just wondering how you guys are approaching WP hooks/lifecycle.

From what I’m seeing, hooks are not firing at all. I managed to get a somewhat reasonable custom route working by manually calling wp_head() and wp_footer() but essentials like the admin bar are not working (no luck with wp_admin_bar_render() / show_admin_bar(true))

Also since filters are not really working there is not a way to for example update wp_head() information.

Am I missing something?