diff --git a/wp-includes/taxonomy.php b/wp-includes/taxonomy.php
index f2db5d81df..6313641d14 100644
--- a/wp-includes/taxonomy.php
+++ b/wp-includes/taxonomy.php
@@ -1912,7 +1912,14 @@ function wp_get_object_terms($object_ids, $taxonomies, $args = array()) {
 
 	// Taxonomies registered without an 'args' param are handled here.
 	if ( ! empty( $taxonomies ) ) {
-		$terms = array_merge( $terms, get_terms( $args ) );
+		$terms_from_remaining_taxonomies = get_terms( $args );
+
+		// Array keys should be preserved for values of $fields that use term_id for keys.
+		if ( ! empty( $args['fields'] ) && 0 === strpos( $args['fields'], 'id=>' ) ) {
+			$terms = $terms + $terms_from_remaining_taxonomies;
+		} else {
+			$terms = array_merge( $terms, $terms_from_remaining_taxonomies );
+		}
 	}
 
 	/**
diff --git a/wp-includes/version.php b/wp-includes/version.php
index a08a164ba7..bd28f198fc 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9-beta1-41808';
+$wp_version = '4.9-beta1-41809';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.