Add New post to existing CPT > White Screen

Hi there -

I created a CPT and added it to my theme functions file. It was working well but the CPT would not show on the front end. I took a tip from another forum post to change permalinks to plain and that fixed it.
I switched the permalinks back to Post Name and it still works on the front end, but now I can't edit or create new posts for the CPT on the back end. Editing existing posts or trying to add new results in completely white screen.

I can create a new CPT and it works fine.

Here's my code:

<?php
add_action( 'init', 'your_prefix_register_post_type' );
function your_prefix_register_post_type() {
    $labels = [
        'name'                     => esc_html__( 'Coaching', 'your-textdomain' ),
        'singular_name'            => esc_html__( 'Coaching', 'your-textdomain' ),
        'add_new'                  => esc_html__( 'Add New', 'your-textdomain' ),
        'add_new_item'             => esc_html__( 'Add new coaching', 'your-textdomain' ),
        'edit_item'                => esc_html__( 'Edit Coaching', 'your-textdomain' ),
        'new_item'                 => esc_html__( 'New Coaching', 'your-textdomain' ),
        'view_item'                => esc_html__( 'View Coaching', 'your-textdomain' ),
        'view_items'               => esc_html__( 'View Coaching', 'your-textdomain' ),
        'search_items'             => esc_html__( 'Search Coaching', 'your-textdomain' ),
        'not_found'                => esc_html__( 'No coaching found', 'your-textdomain' ),
        'not_found_in_trash'       => esc_html__( 'No coaching found in Trash', 'your-textdomain' ),
        'parent_item_colon'        => esc_html__( 'Parent Coaching:', 'your-textdomain' ),
        'all_items'                => esc_html__( 'All Coaching', 'your-textdomain' ),
        'archives'                 => esc_html__( 'Coaching Archives', 'your-textdomain' ),
        'attributes'               => esc_html__( 'Coaching Attributes', 'your-textdomain' ),
        'insert_into_item'         => esc_html__( 'Insert into coaching', 'your-textdomain' ),
        'uploaded_to_this_item'    => esc_html__( 'Uploaded to this coaching', 'your-textdomain' ),
        'featured_image'           => esc_html__( 'Featured image', 'your-textdomain' ),
        'set_featured_image'       => esc_html__( 'Set featured image', 'your-textdomain' ),
        'remove_featured_image'    => esc_html__( 'Remove featured image', 'your-textdomain' ),
        'use_featured_image'       => esc_html__( 'Use as featured image', 'your-textdomain' ),
        'menu_name'                => esc_html__( 'Coaching', 'your-textdomain' ),
        'filter_items_list'        => esc_html__( 'Filter coaching list', 'your-textdomain' ),
        'items_list_navigation'    => esc_html__( 'Coaching list navigation', 'your-textdomain' ),
        'items_list'               => esc_html__( 'Coaching list', 'your-textdomain' ),
        'item_published'           => esc_html__( 'Coaching published', 'your-textdomain' ),
        'item_published_privately' => esc_html__( 'Coaching published privately', 'your-textdomain' ),
        'item_reverted_to_draft'   => esc_html__( 'Coaching reverted to draft', 'your-textdomain' ),
        'item_scheduled'           => esc_html__( 'Coaching scheduled', 'your-textdomain' ),
        'item_updated'             => esc_html__( 'Coaching updated', 'your-textdomain' ),
        'text_domain'              => esc_html__( 'your-textdomain', 'your-textdomain' ),
    ];
    $args = [
        'label'               => esc_html__( 'Coaching', 'your-textdomain' ),
        'labels'              => $labels,
        'description'         => '',
        'public'              => true,
        'hierarchical'        => false,
        'exclude_from_search' => false,
        'publicly_queryable'  => true,
        'show_ui'             => true,
        'show_in_nav_menus'   => true,
        'show_in_admin_bar'   => true,
        'show_in_rest'        => true,
        'query_var'           => true,
        'can_export'          => true,
        'delete_with_user'    => true,
        'has_archive'         => false,
        'rest_base'           => '',
        'show_in_menu'        => true,
        'menu_icon'           => 'dashicons-star-empty',
        'menu_position'       => 28,
        'capability_type'     => 'post',
        'supports'            => ['title', 'editor', 'thumbnail'],
        'taxonomies'          => [],
        'rewrite'             => [
            'with_front' => false,
        ],
    ];

    register_post_type( 'coaching', $args );
}

From the error console when I try to add new:

Uncaught (in promise) Error: The entity being edited (postType, undefined) does not have a loaded config.
    at core-data.min.js?ver=cae70cc4927f8b371fa13262d47b23e0:2
    at tryCatch (wp-polyfill.min.js?ver=7.4.4:1)
    at Generator.invoke [as _invoke] (wp-polyfill.min.js?ver=7.4.4:1)
    at Generator.t.<computed> [as next] (wp-polyfill.min.js?ver=7.4.4:1)
    at redux-routine.min.js?ver=284288e957394d2097c6fbe95625e2fb:2
    at redux-routine.min.js?ver=284288e957394d2097c6fbe95625e2fb:2
    at redux-routine.min.js?ver=284288e957394d2097c6fbe95625e2fb:2
    at Array.some (<anonymous>)
    at e (redux-routine.min.js?ver=284288e957394d2097c6fbe95625e2fb:2)
    at redux-routine.min.js?ver=284288e957394d2097c6fbe95625e2fb:2
post-new.php?post_type=coaching:1 Unchecked runtime.lastError: The message port closed before a response was received.