--- a/mercurial/context.py	Sat Jul 11 01:14:00 2020 +0200
+++ b/mercurial/context.py	Sat Jul 11 02:13:19 2020 +0200
@@ -2891,6 +2891,11 @@
 
         return scmutil.status(modified, added, removed, [], [], [], [])
 
+    def parents(self):
+        if self._parents[1].node() == nullid:
+            return [self._parents[0]]
+        return self._parents
+
 
 class memfilectx(committablefilectx):
     """memfilectx represents an in-memory file to commit.