Ticket #37658: 37658.diff

src/wp-includes/post.php

@@ -3260 +3260 @@
         }
 
         // Set or remove featured image.
-        if ( isset( $postarr['_thumbnail_id'] ) && ( post_type_supports( $post_type, 'thumbnail' ) || 'revision' === $post_type ) ) {
-                $thumbnail_id = intval( $postarr['_thumbnail_id'] );
-                if ( -1 === $thumbnail_id ) {
-                        delete_post_thumbnail( $post_ID );
-                } else {
-                        set_post_thumbnail( $post_ID, $thumbnail_id );
+        if ( isset( $postarr['_thumbnail_id'] ) ) {
+                $thumbnail_support = post_type_supports( $post_type, 'thumbnail' ) || 'revision' === $post_type;
+                if ( ! $thumbnail_support && 'attachment' === $post_type && $post_mime_type ) {
+                        if ( wp_attachment_is( 'audio', $post_ID ) ) {
+                                $thumbnail_support = post_type_supports( 'attachment:audio', 'thumbnail' );
+                        } elseif ( wp_attachment_is( 'video', $post_ID ) ) {
+                                $thumbnail_support = post_type_supports( 'attachment:video', 'thumbnail' );
+                        }
                 }
+
+                if ( $thumbnail_support ) {
+                        $thumbnail_id = intval( $postarr['_thumbnail_id'] );
+                        if ( -1 === $thumbnail_id ) {
+                                delete_post_thumbnail( $post_ID );
+                        } else {
+                                set_post_thumbnail( $post_ID, $thumbnail_id );
+                        }
+                }
         }
 
         if ( ! empty( $postarr['meta_input'] ) ) {