diff -r c1b603cdc95a -r 5c8230ca37f2 mercurial/subrepo.py
--- a/mercurial/subrepo.py	Mon Sep 21 09:57:29 2020 -0700
+++ b/mercurial/subrepo.py	Mon Sep 21 11:53:44 2020 -0700
@@ -787,7 +787,7 @@
         if overwrite:
             merge.clean_update(repo[revision])
         else:
-            hg.updaterepo(repo, revision, False)
+            merge.update(repo[revision])
 
     @annotatesubrepoerror
     def merge(self, state):