diff --git a/gutenberg.php b/gutenberg.php
index 51e6846fe..62342b124 100644
--- a/gutenberg.php
+++ b/gutenberg.php
@@ -14,7 +14,7 @@
 
 ### BEGIN AUTO-GENERATED DEFINES
 define( 'GUTENBERG_VERSION', '19.6.0' );
-define( 'GUTENBERG_GIT_COMMIT', 'fbdc0f97dc463f2a2860de10b8d08cda3d8f69da' );
+define( 'GUTENBERG_GIT_COMMIT', '99d22755b4e92b5bc09856b2c14a9564fb6797fc' );
 ### END AUTO-GENERATED DEFINES
 defined( 'GUTENBERG_MINIMUM_WP_VERSION' ) or define( 'GUTENBERG_MINIMUM_WP_VERSION', '6.5' );
 
diff --git a/lib/compat/wordpress-6.7/blocks.php b/lib/compat/wordpress-6.7/blocks.php
index 1a8e7f574..e73980800 100644
--- a/lib/compat/wordpress-6.7/blocks.php
+++ b/lib/compat/wordpress-6.7/blocks.php
@@ -59,6 +59,16 @@ function gutenberg_add_format_query_vars_to_query_loop_block( $query, $block ) {
 		return $query;
 	}
 
+	// Return early if the query already contains a post format. This is to avoid duplication if the
+	// WordPress core filter is already applied.
+	if ( ! empty( $query['tax_query'] ) ) {
+		foreach ( $query['tax_query'] as $taxquery ) {
+			if ( isset( $taxquery['taxonomy'] ) && 'post_format' === $taxquery['taxonomy'] ) {
+				return $query;
+			}
+		}
+	}
+
 	$formats = $block->context['query']['format'];
 	/*
 	 * Validate that the format is either `standard` or a supported post format.