How am I supposed to install the bundle on 3.0?

[manuxi]

composer require sulu/form-bundle works, but cache:clear dies:
Cannot load resource "@SuluFormBundle/Resources/config/routing_api.yml". Make sure the "SuluFormBundle/Resources/config/routing_api.yml" bundle is correctly registered and loaded in the application kernel class. If the bundle is registered, make sure the bundle path "@SuluFormBundle/Resources/config/routing_api.yml" is not empty.

Everything looks ok so far:

sulu_form_admin.yaml exists with the following content:
sulu_form_api:
resource: "@SuluFormBundle/Resources/config/routing_api.yml" <= here, an 'a' is missing!
type: rest
prefix: /admin/api

vendor/sulu/form-bundle/Resources/config/routing_api.yaml exists

bundles.php
...Sulu\Bundle\FormBundle\SuluFormBundle::class => ['all' => true],

What else could it be?