diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -438,6 +438,11 @@
         raise error.Abort(_(b'at least one of -n/-c is required for -l'))
 
     rev = opts.get(b'rev')
+    if not rev:
+        # Avoid loading obsmarkers if we're accessing only the working copy
+        # parent (which will never be hidden).
+        repo = repo.unfiltered()
+
     if rev:
         repo = scmutil.unhidehashlikerevs(repo, [rev], b'nowarn')
     ctx = scmutil.revsingle(repo, rev)