From 35869a39fb5493fd813f2d24414e19c0fb1761d7 Mon Sep 17 00:00:00 2001
From: Valeri Karpov <val@karpov.io>
Date: Sat, 11 Jul 2020 15:40:05 -0400
Subject: [PATCH] fix(document): clear out `priorDoc` after overwriting single
 nested subdoc so changes after overwrite get persisted correctly

Fix #9208
---
 lib/types/subdocument.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/types/subdocument.js b/lib/types/subdocument.js
index 521237aee72..b015a091cf3 100644
--- a/lib/types/subdocument.js
+++ b/lib/types/subdocument.js
@@ -48,6 +48,8 @@ function Subdocument(value, fields, parent, skipId, options) {
         }
       }
     }
+
+    delete options.priorDoc;
   }
 }