Index: src/js/_enqueues/admin/tags-box.js
===================================================================
--- src/js/_enqueues/admin/tags-box.js	(revision 45196)
+++ src/js/_enqueues/admin/tags-box.js	(working copy)
@@ -384,11 +384,6 @@
 					event.preventDefault();
 					event.stopPropagation();
 				}
-			}).keypress( function( event ) {
-				if ( 13 == event.which ) {
-					event.preventDefault();
-					event.stopPropagation();
-				}
 			}).each( function( i, element ) {
 				$( element ).wpTagsSuggest();
 			});
Index: src/js/_enqueues/admin/tags-suggest.js
===================================================================
--- src/js/_enqueues/admin/tags-suggest.js	(revision 45196)
+++ src/js/_enqueues/admin/tags-suggest.js	(working copy)
@@ -107,6 +107,11 @@
 					window.wp.a11y.speak( window.tagsSuggestL10n.termSelected, 'assertive' );
 					event.preventDefault();
 				} else if ( $.ui.keyCode.ENTER === event.keyCode ) {
+					if ( window.tagBox ) {
+						window.tagBox.userAction = 'add';
+						window.tagBox.flushTags( $( this ).closest( '.tagsdiv' ) );
+					}
+
 					// Do not close Quick Edit / Bulk Edit
 					event.preventDefault();
 					event.stopPropagation();