diff -r 87b004378fc4 -r 8020be6a9d28 mercurial/debugcommands.py
--- a/mercurial/debugcommands.py	Thu Feb 02 17:21:45 2023 +0100
+++ b/mercurial/debugcommands.py	Thu Feb 02 17:22:55 2023 +0100
@@ -1278,7 +1278,7 @@
     if opts.get(b'old'):
 
         def doit(pushedrevs, remoteheads, remote=remote):
-            if not util.safehasattr(remote, b'branches'):
+            if not util.safehasattr(remote, 'branches'):
                 # enable in-client legacy support
                 remote = localrepo.locallegacypeer(remote.local())
                 if remote_revs: