Index: src/wp-includes/class-wp-fatal-error-handler.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- src/wp-includes/class-wp-fatal-error-handler.php	(revision 45258)
+++ src/wp-includes/class-wp-fatal-error-handler.php	(date 1556050382000)
@@ -161,7 +161,11 @@
 			require_once ABSPATH . WPINC . '/functions.php';
 		}
 
-		$message = __( 'The site is experiencing technical difficulties.' );
+		if ( is_protected_endpoint() ) {
+			$message = __( 'The site is experiencing technical difficulties. Please check your site admin email inbox for instructions.' );
+		} else {
+			$message = __( 'The site is experiencing technical difficulties.' );
+		}
 
 		$args = array(
 			'response' => 500,