diff -r c1b603cdc95a -r 5c8230ca37f2 mercurial/shelve.py
--- a/mercurial/shelve.py	Mon Sep 21 09:57:29 2020 -0700
+++ b/mercurial/shelve.py	Mon Sep 21 11:53:44 2020 -0700
@@ -839,7 +839,7 @@
             state.nodestoremove.append(newnode)
             shelvectx = repo[newnode]
 
-        hg.updaterepo(repo, pendingctx.node(), overwrite=False)
+        merge.update(pendingctx)
         mergefiles(ui, repo, state.wctx, shelvectx)
         restorebranch(ui, repo, state.branchtorestore)
 
@@ -1031,7 +1031,7 @@
             ui.status(msg)
         else:
             shelvectx = repo[newnode]
-            hg.updaterepo(repo, tmpwctx.node(), False)
+            merge.update(tmpwctx)
 
     return shelvectx, ispartialunshelve