diff --git a/wp-includes/script-loader.php b/wp-includes/script-loader.php
index 4fb9f3059f..b611292dcb 100644
--- a/wp-includes/script-loader.php
+++ b/wp-includes/script-loader.php
@@ -3020,7 +3020,7 @@ function wp_enqueue_block_support_styles( $style, $priority = 10 ) {
  *     Default empty array.
  *
  *     @type bool $optimize Whether to optimize the CSS output, e.g., combine rules.
- *                          Default false.
+ *                          Default true.
  *     @type bool $prettify Whether to add new lines and indents to output.
  *                          Default to whether the `SCRIPT_DEBUG` constant is defined.
  * }
diff --git a/wp-includes/style-engine.php b/wp-includes/style-engine.php
index 5b5545c85e..4a93d2cc5a 100644
--- a/wp-includes/style-engine.php
+++ b/wp-includes/style-engine.php
@@ -130,7 +130,7 @@ function wp_style_engine_get_styles( $block_styles, $options = array() ) {
  *                                 e.g. 'block-supports' or 'global-styles'. Default 'block-supports'.
  *                                 When set, the style engine will attempt to store the CSS rules.
  *     @type bool        $optimize Whether to optimize the CSS output, e.g. combine rules.
- *                                 Default false.
+ *                                 Default true.
  *     @type bool        $prettify Whether to add new lines and indents to output.
  *                                 Defaults to whether the `SCRIPT_DEBUG` constant is defined.
  * }
@@ -178,7 +178,7 @@ function wp_style_engine_get_stylesheet_from_css_rules( $css_rules, $options = a
  *     Optional. An array of options. Default empty array.
  *
  *     @type bool $optimize Whether to optimize the CSS output, e.g. combine rules.
- *                          Default false.
+ *                          Default true.
  *     @type bool $prettify Whether to add new lines and indents to output.
  *                          Defaults to whether the `SCRIPT_DEBUG` constant is defined.
  * }
diff --git a/wp-includes/style-engine/class-wp-style-engine-processor.php b/wp-includes/style-engine/class-wp-style-engine-processor.php
index 05827e41af..c603d1c509 100644
--- a/wp-includes/style-engine/class-wp-style-engine-processor.php
+++ b/wp-includes/style-engine/class-wp-style-engine-processor.php
@@ -90,7 +90,7 @@ class WP_Style_Engine_Processor {
 	 *     Optional. An array of options. Default empty array.
 	 *
 	 *     @type bool $optimize Whether to optimize the CSS output, e.g. combine rules.
-	 *                          Default false.
+	 *                          Default true.
 	 *     @type bool $prettify Whether to add new lines and indents to output.
 	 *                          Defaults to whether the `SCRIPT_DEBUG` constant is defined.
 	 * }
diff --git a/wp-includes/style-engine/class-wp-style-engine.php b/wp-includes/style-engine/class-wp-style-engine.php
index 9a9da37e69..de8d00467e 100644
--- a/wp-includes/style-engine/class-wp-style-engine.php
+++ b/wp-includes/style-engine/class-wp-style-engine.php
@@ -606,7 +606,7 @@ final class WP_Style_Engine {
 	 *                                 e.g. 'block-supports' or 'global-styles'. Default 'block-supports'.
 	 *                                 When set, the style engine will attempt to store the CSS rules.
 	 *     @type bool        $optimize Whether to optimize the CSS output, e.g. combine rules.
-	 *                                 Default false.
+	 *                                 Default true.
 	 *     @type bool        $prettify Whether to add new lines and indents to output.
 	 *                                 Defaults to whether the `SCRIPT_DEBUG` constant is defined.
 	 * }
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 5a8e95c264..7a20741451 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.3-alpha-55819';
+$wp_version = '6.3-alpha-55820';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.