Index: src/js/_enqueues/lib/embed-template.js
===================================================================
--- src/js/_enqueues/lib/embed-template.js	(revision 49177)
+++ src/js/_enqueues/lib/embed-template.js	(working copy)
@@ -161,6 +161,11 @@
 				href = target.parentElement.getAttribute( 'href' );
 			}
 
+			// Only clicks from the primary mouse button without any modifiers need to be catched.
+			if ( event.ctrlKey || event.metaKey ) {
+				return;
+			}
+
 			/**
 			 * Send link target to the parent (embedding) site.
 			 */