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wp-includes/interactivity-api/class-wp-interactivity-api.php

@@ -1032,6 +1032,20 @@ final class WP_Interactivity_API {
 						return;
 				}
 
+				// Skip if the suffix is an event handler.
+				if ( str_starts_with( $entry['suffix'], 'on' ) ) {
+					_doing_it_wrong(
+						__METHOD__,
+						sprintf(
+							/* translators: %s: The directive, e.g. data-wp-on--click. */
+							__( 'Binding event handler attributes is not supported. Please use "%s" instead.' ),
+							esc_attr( 'data-wp-on--' . substr( $entry['suffix'], 2 ) )
+						),
+						'6.9.2'
+					);
+					continue;
+				}
+
 				$result = $this->evaluate( $entry );
 
 				if (