diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
index 97ee830261..dbab4c933e 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
@@ -304,6 +304,17 @@ class WP_REST_Attachments_Controller extends WP_REST_Posts_Controller {
 		$attachment->post_mime_type = $type;
 		$attachment->guid           = $url;
 
+		// If the title was not set, use the original filename.
+		if ( empty( $attachment->post_title ) && ! empty( $files['file']['name'] ) ) {
+			// Remove the file extension (after the last `.`)
+			$tmp_title = substr( $files['file']['name'], 0, strrpos( $files['file']['name'], '.' ) );
+
+			if ( ! empty( $tmp_title ) ) {
+				$attachment->post_title = $tmp_title;
+			}
+		}
+
+		// Fall back to the original approach.
 		if ( empty( $attachment->post_title ) ) {
 			$attachment->post_title = preg_replace( '/\.[^.]+$/', '', wp_basename( $file ) );
 		}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 4ad3ea0e8c..1b483a2320 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.6-beta3-58446';
+$wp_version = '6.6-beta3-58447';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.