Index: src/wp-includes/class-wp-recovery-mode-email-service.php
===================================================================
--- src/wp-includes/class-wp-recovery-mode-email-service.php	(revision 45721)
+++ src/wp-includes/class-wp-recovery-mode-email-service.php	(working copy)
@@ -143,7 +143,9 @@
 			'Howdy!
 
 Since WordPress 5.2 there is a built-in feature that detects when a plugin or theme causes a fatal error on your site, and notifies you with this automated email.
+
 ###CAUSE###
+
 First, visit your website (###SITEURL###) and check for any visible issues. Next, visit the page where the error was caught (###PAGEURL###) and check for any visible issues.
 
 ###SUPPORT###
@@ -169,7 +171,7 @@
 			array(
 				$url,
 				human_time_diff( time() + $rate_limit ),
-				$cause ? "\n{$cause}\n" : "\n",
+				$cause ? $cause : __( 'In this case, WordPress caught an unknown error.' ),
 				$details,
 				home_url( '/' ),
 				home_url( $_SERVER['REQUEST_URI'] ),