post-new-is-block-editor.diff

diff --git src/wp-admin/post-new.php src/wp-admin/post-new.php
index 153cba2dc4..8159f04ff9 100644
--- src/wp-admin/post-new.php
+++ src/wp-admin/post-new.php
@@ -6,8 +6,8 @@
  * @subpackage Administration
  */
 
-/** Load WordPress Administration Bootstrap */
-require_once( dirname( __FILE__ ) . '/admin.php' );
+require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );
+require_once( ABSPATH . 'wp-admin/includes/admin.php' );
 
 /**
  * @global string  $post_type
@@ -66,6 +66,11 @@ if ( ! current_user_can( $post_type_object->cap->edit_posts ) || ! current_user_
 $post    = get_default_post_to_edit( $post_type, true );
 $post_ID = $post->ID;
 
+WP_Screen::get( $pagenow )->is_block_editor( use_block_editor_for_post( $post ) );
+
+/** Load WordPress Administration Bootstrap */
+require_once( dirname( __FILE__ ) . '/admin.php' );
+
 /** This filter is documented in wp-admin/post.php */
 if ( apply_filters( 'replace_editor', false, $post ) !== true ) {
 	if ( use_block_editor_for_post( $post ) ) {