1. The issue and what you expected to happen
   The GraphQL endpoints returns an validation error about missing required fields
   when updating a single field
   while it should simply update the single field and leave the required fields as-is

2. Exact steps to reproduce this issue

1. Add a custom field to the directus_users tabel
2. Update that field of the user with `update_users

Describe the bug
while filtering the permited post types via distributable_post_types, I noticed that the dropdown in de Pull UI has all the post types in the dropdown.

Steps to Reproduce
Filter the permited post types:

add_filter( 'distributable_post_types', function() {
    return [ 'post' => 'post' ];
});

Go to the Pull overview page en check the dropdown.