Index: src/bp-core/classes/class-bp-button.php
===================================================================
--- src/bp-core/classes/class-bp-button.php
+++ src/bp-core/classes/class-bp-button.php
@@ -302,6 +302,10 @@
 				$r['parent_attr']['class'] .= 'generic-button';
 			}
 
+			// Set parent element props.
+			$this->parent_element = $r['parent_element'];
+			$this->parent_attr    = $r['parent_attr'];
+
 			// Render parent element attributes.
 			$parent_elem = new BP_Core_HTML_Element( array(
 				'element' => $r['parent_element'],