diff --git a/wp-admin/includes/media.php b/wp-admin/includes/media.php
index 186769dd36..816107a3ff 100644
--- a/wp-admin/includes/media.php
+++ b/wp-admin/includes/media.php
@@ -3740,17 +3740,17 @@ function wp_get_media_creation_timestamp( $metadata ) {
 
 		case 'matroska':
 		case 'webm':
-			if ( isset( $metadata['matroska']['comments']['creation_time']['0'] ) ) {
-				$creation_date = strtotime( $metadata['matroska']['comments']['creation_time']['0'] );
-			} elseif ( isset( $metadata['matroska']['info']['0']['DateUTC_unix'] ) ) {
-				$creation_date = (int) $metadata['matroska']['info']['0']['DateUTC_unix'];
+			if ( isset( $metadata['matroska']['comments']['creation_time'][0] ) ) {
+				$creation_date = strtotime( $metadata['matroska']['comments']['creation_time'][0] );
+			} elseif ( isset( $metadata['matroska']['info'][0]['DateUTC_unix'] ) ) {
+				$creation_date = (int) $metadata['matroska']['info'][0]['DateUTC_unix'];
 			}
 			break;
 
 		case 'quicktime':
 		case 'mp4':
-			if ( isset( $metadata['quicktime']['moov']['subatoms']['0']['creation_time_unix'] ) ) {
-				$creation_date = (int) $metadata['quicktime']['moov']['subatoms']['0']['creation_time_unix'];
+			if ( isset( $metadata['quicktime']['moov']['subatoms'][0]['creation_time_unix'] ) ) {
+				$creation_date = (int) $metadata['quicktime']['moov']['subatoms'][0]['creation_time_unix'];
 			}
 			break;
 	}
diff --git a/wp-includes/media.php b/wp-includes/media.php
index 01543b9dcd..0450b4512f 100644
--- a/wp-includes/media.php
+++ b/wp-includes/media.php
@@ -1129,7 +1129,7 @@ function wp_get_attachment_image( $attachment_id, $size = 'thumbnail', $icon = f
  */
 function wp_get_attachment_image_url( $attachment_id, $size = 'thumbnail', $icon = false ) {
 	$image = wp_get_attachment_image_src( $attachment_id, $size, $icon );
-	return isset( $image['0'] ) ? $image['0'] : false;
+	return isset( $image[0] ) ? $image[0] : false;
 }
 
 /**
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 0b8bedd8e2..19360d0db3 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-52244';
+$wp_version = '5.9-alpha-52245';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.