Index: src/wp-includes/blocks.php
===================================================================
--- src/wp-includes/blocks.php	(revision 60178)
+++ src/wp-includes/blocks.php	(working copy)
@@ -173,7 +173,10 @@
 	$module_asset        = ! empty( $module_asset_path ) ? require $module_asset_path : array();
 	$module_dependencies = isset( $module_asset['dependencies'] ) ? $module_asset['dependencies'] : array();
 	$block_version       = isset( $metadata['version'] ) ? $metadata['version'] : false;
-	$module_version      = isset( $module_asset['version'] ) ? $module_asset['version'] : $block_version;
+	if ( SCRIPT_DEBUG ) {
+		$block_version = time();
+	}
+	$module_version = isset( $module_asset['version'] ) ? $module_asset['version'] : $block_version;
 
 	wp_register_script_module(
 		$module_id,
@@ -239,8 +242,11 @@
 	$script_uri          = get_block_asset_url( $script_path_norm );
 	$script_dependencies = isset( $script_asset['dependencies'] ) ? $script_asset['dependencies'] : array();
 	$block_version       = isset( $metadata['version'] ) ? $metadata['version'] : false;
-	$script_version      = isset( $script_asset['version'] ) ? $script_asset['version'] : $block_version;
-	$script_args         = array();
+	if ( SCRIPT_DEBUG ) {
+		$block_version = time();
+	}
+	$script_version = isset( $script_asset['version'] ) ? $script_asset['version'] : $block_version;
+	$script_args    = array();
 	if ( 'viewScript' === $field_name && $script_uri ) {
 		$script_args['strategy'] = 'defer';
 	}
@@ -328,12 +334,15 @@
 	$style_path_norm = wp_normalize_path( realpath( dirname( $metadata['file'] ) . '/' . $style_path ) );
 	$style_uri       = get_block_asset_url( $style_path_norm );
 
-	$version = ! $is_core_block && isset( $metadata['version'] ) ? $metadata['version'] : false;
-	$result  = wp_register_style(
+	$style_version   = ! $is_core_block && isset( $metadata['version'] ) ? $metadata['version'] : false;
+	if ( SCRIPT_DEBUG ) {
+		$style_version = time();
+	}
+	$result = wp_register_style(
 		$style_handle_name,
 		$style_uri,
 		array(),
-		$version
+		$style_version
 	);
 	if ( ! $result ) {
 		return false;