"The editor has encountered an unexpected error." for CPT with hierarchical option enabled, with the page-attributes without title support

[mipon]

Describe the bug
The Gutenberg editor crushes with the error "The editor has encountered an unexpected error." when creating a new post for a custom post type that supports hierarchical relations and page attributes without the title support with the supports argument.

    'hierarchical' => true,
    'supports' => array( 'page-attributes', 'editor' ), // omit 'title'

Error

TypeError: Cannot read property 'raw' of undefined
at http://{site address}/wp-includes/js/dist/editor.min.js?ver=9.7.5:11:66922
at Array.map (<anonymous>)
at http://{site address}/wp-includes/js/dist/editor.min.js?ver=9.7.5:11:66861
at je (http://{site address}/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:78:476)
at qe (http://{site address}/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:89:115)
at ph (http://{site address}/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:216:489)
at lh (http://{site address}/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:126:409)
at O (http://{site address}/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:121:71)
at ze (http://{site address}/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:118:14)
at http://{site address}/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.9.0:53:49

To reproduce
Steps to reproduce the behavior:

1. Create a custom post type with the following arguments
   • hierarchical: true
   • supports: array( 'page-attributes', 'editor', 'thumbnail', 'comments', 'post-formats' )
2. Go to Add New for the created custom post type and wait for several seconds.
3. The error message box appears.

Expected behavior
The editor should not crush, Instead, it should load the Page Attributes section properly.

Screenshots

Additional context

• The crush seems to occur when the page selecting drop-down list in the Page Attribute section is going to be loaded as it has to list the posts with their titles.

I suggest not using the drop-down list with tons of posts there but placing an auto-complete input field. This also helps for situations with thousands of posts.