Steps to reproduce:

1. create collection Categories
2. create collection Articles
3. add relational field to Articles for example M2O
4. add rule Author with all permissions on Articles and only read permission on Categories

When author user add/edit Article visually he can add/edit Category. Finally if saving got an arror:

{
  "message": "You do

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.