--- a/mercurial/wireprotov1server.py	Thu May 07 03:14:52 2020 -0700
+++ b/mercurial/wireprotov1server.py	Fri Apr 24 20:00:25 2020 +0200
@@ -391,7 +391,7 @@
     res = exchange.filterclonebundleentries(repo, res)
     if not res:
         return None
-    cl = repo.changelog
+    cl = repo.unfiltered().changelog
     heads_anc = cl.ancestors([cl.rev(rev) for rev in heads], inclusive=True)
     common_anc = cl.ancestors([cl.rev(rev) for rev in common], inclusive=True)
     compformats = clientcompressionsupport(proto)