Index: src/wp-admin/includes/class-wp-site-health.php
===================================================================
--- src/wp-admin/includes/class-wp-site-health.php	(revision 45155)
+++ src/wp-admin/includes/class-wp-site-health.php	(working copy)
@@ -416,7 +416,7 @@
 		$themes_inactive     = 0;
 
 		// This value is changed during processing to determine how many themes are considered a reasonable amount.
-		$allowed_theme_count = 1;
+		$allowed_theme_count = 0;
 
 		$has_default_theme   = false;
 		$has_unused_themes   = false;