diff -r eca88f5fbcb2 -r 324ded1aa2ab mercurial/copies.py
--- a/mercurial/copies.py	Fri Mar 05 14:26:52 2021 -0800
+++ b/mercurial/copies.py	Fri Mar 05 14:26:56 2021 -0800
@@ -761,9 +761,12 @@
         base = None
         if a.rev() != nullrev:
             base = x
+        x_copies = _forwardcopies(a, x)
+        y_copies = _forwardcopies(a, y, base, match=match)
+        x_backward_renames = _reverse_renames(x_copies, x, match)
         copies = _chain(
-            _backwardrenames(x, a, match=match),
-            _forwardcopies(a, y, base, match=match),
+            x_backward_renames,
+            y_copies,
         )
     _filter(x, y, copies)
     return copies