diff -r 7b1b88e27a20 -r 48c4eec2b7e6 wp/wp-includes/blocks/post-content.php
--- a/wp/wp-includes/blocks/post-content.php	Thu Sep 29 08:06:27 2022 +0200
+++ b/wp/wp-includes/blocks/post-content.php	Fri Sep 05 18:40:08 2025 +0200
@@ -8,6 +8,8 @@
 /**
  * Renders the `core/post-content` block on the server.
  *
+ * @since 5.8.0
+ *
  * @param array    $attributes Block attributes.
  * @param string   $content    Block default content.
  * @param WP_Block $block      Block instance.
@@ -25,8 +27,7 @@
 	if ( isset( $seen_ids[ $post_id ] ) ) {
 		// WP_DEBUG_DISPLAY must only be honored when WP_DEBUG. This precedent
 		// is set in `wp_debug_mode()`.
-		$is_debug = defined( 'WP_DEBUG' ) && WP_DEBUG &&
-			defined( 'WP_DEBUG_DISPLAY' ) && WP_DEBUG_DISPLAY;
+		$is_debug = WP_DEBUG && WP_DEBUG_DISPLAY;
 
 		return $is_debug ?
 			// translators: Visible only in the front end, this warning takes the place of a faulty block.
@@ -36,12 +37,6 @@
 
 	$seen_ids[ $post_id ] = true;
 
-	// Check is needed for backward compatibility with third-party plugins
-	// that might rely on the `in_the_loop` check; calling `the_post` sets it to true.
-	if ( ! in_the_loop() && have_posts() ) {
-		the_post();
-	}
-
 	// When inside the main loop, we want to use queried object
 	// so that `the_preview` for the current post can apply.
 	// We force this behavior by omitting the third argument (post ID) from the `get_the_content`.
@@ -70,6 +65,8 @@
 
 /**
  * Registers the `core/post-content` block on the server.
+ *
+ * @since 5.8.0
  */
 function register_block_core_post_content() {
 	register_block_type_from_metadata(