diff --git a/lib/class-wp-theme-json-gutenberg.php b/lib/class-wp-theme-json-gutenberg.php
index d685c7bdc846dd..a72870e1bb70f8 100644
--- a/lib/class-wp-theme-json-gutenberg.php
+++ b/lib/class-wp-theme-json-gutenberg.php
@@ -729,15 +729,9 @@ public function __construct( $theme_json = array( 'version' => WP_Theme_JSON_Gut
 		$registry            = WP_Block_Type_Registry::get_instance();
 		$valid_block_names   = array_keys( $registry->get_all_registered() );
 		$valid_element_names = array_keys( static::ELEMENTS );
-		$valid_variations    = array();
-		foreach ( self::get_blocks_metadata() as $block_name => $block_meta ) {
-			if ( ! isset( $block_meta['styleVariations'] ) ) {
-				continue;
-			}
-			$valid_variations[ $block_name ] = array_keys( $block_meta['styleVariations'] );
-		}
-		$theme_json       = static::sanitize( $this->theme_json, $valid_block_names, $valid_element_names, $valid_variations );
-		$this->theme_json = static::maybe_opt_in_into_settings( $theme_json );
+		$valid_variations    = static::get_valid_block_style_variations();
+		$theme_json          = static::sanitize( $this->theme_json, $valid_block_names, $valid_element_names, $valid_variations );
+		$this->theme_json    = static::maybe_opt_in_into_settings( $theme_json );
 
 		// Internally, presets are keyed by origin.
 		$nodes = static::get_setting_nodes( $this->theme_json );
@@ -3130,13 +3124,7 @@ public static function remove_insecure_properties( $theme_json ) {
 
 		$valid_block_names   = array_keys( static::get_blocks_metadata() );
 		$valid_element_names = array_keys( static::ELEMENTS );
-		$valid_variations    = array();
-		foreach ( self::get_blocks_metadata() as $block_name => $block_meta ) {
-			if ( ! isset( $block_meta['styleVariations'] ) ) {
-				continue;
-			}
-			$valid_variations[ $block_name ] = array_keys( $block_meta['styleVariations'] );
-		}
+		$valid_variations    = static::get_valid_block_style_variations();
 
 		$theme_json = static::sanitize( $theme_json, $valid_block_names, $valid_element_names, $valid_variations );
 
@@ -4043,4 +4031,21 @@ function ( $matches ) use ( $variation_class ) {
 
 		return implode( ',', $result );
 	}
+
+	/**
+	 * Collects valid block style variations keyed by block type.
+	 *
+	 * @return array Valid block style variations by block type.
+	 */
+	protected static function get_valid_block_style_variations() {
+		$valid_variations = array();
+		foreach ( self::get_blocks_metadata() as $block_name => $block_meta ) {
+			if ( ! isset( $block_meta['styleVariations'] ) ) {
+				continue;
+			}
+			$valid_variations[ $block_name ] = array_keys( $block_meta['styleVariations'] );
+		}
+
+		return $valid_variations;
+	}
 }