Index: src/wp-includes/blocks.php
===================================================================
--- src/wp-includes/blocks.php	(revision 52732)
+++ src/wp-includes/blocks.php	(working copy)
@@ -107,7 +107,7 @@
 		return false;
 	}
 	// Path needs to be normalized to work in Windows env.
-	$wpinc_path_norm  = wp_normalize_path( ABSPATH . WPINC );
+	$wpinc_path_norm  = wp_normalize_path( realpath( ABSPATH . WPINC ) );
 	$script_path_norm = wp_normalize_path( realpath( dirname( $metadata['file'] ) . '/' . $script_path ) );
 	$is_core_block    = isset( $metadata['file'] ) && 0 === strpos( $metadata['file'], $wpinc_path_norm );
 
@@ -149,7 +149,7 @@
 	if ( empty( $metadata[ $field_name ] ) ) {
 		return false;
 	}
-	$wpinc_path_norm = wp_normalize_path( ABSPATH . WPINC );
+	$wpinc_path_norm = wp_normalize_path( realpath( ABSPATH . WPINC ) );
 	$is_core_block   = isset( $metadata['file'] ) && 0 === strpos( $metadata['file'], $wpinc_path_norm );
 	if ( $is_core_block && ! wp_should_load_separate_core_block_assets() ) {
 		return false;
@@ -243,7 +243,7 @@
 	if ( ! is_array( $metadata ) || empty( $metadata['name'] ) ) {
 		return false;
 	}
-	$metadata['file'] = wp_normalize_path( $metadata_file );
+	$metadata['file'] = wp_normalize_path( realpath( $metadata_file ) );
 
 	/**
 	 * Filters the metadata provided for registering a block type.