diff -r 0750cbffdb3b -r f652b7ddc1d4 mercurial/context.py
--- a/mercurial/context.py	Fri Dec 27 12:41:56 2019 -0800
+++ b/mercurial/context.py	Fri Dec 27 14:08:02 2019 -0800
@@ -2224,7 +2224,7 @@
         ]
 
     def p1copies(self):
-        copies = self._repo._wrappedctx.p1copies().copy()
+        copies = {}
         narrowmatch = self._repo.narrowmatch()
         for f in self._cache.keys():
             if not narrowmatch(f):
@@ -2236,7 +2236,7 @@
         return copies
 
     def p2copies(self):
-        copies = self._repo._wrappedctx.p2copies().copy()
+        copies = {}
         narrowmatch = self._repo.narrowmatch()
         for f in self._cache.keys():
             if not narrowmatch(f):