diff -r 69c5f8d6c710 -r f28c52a9f7b4 mercurial/bundle2.py
--- a/mercurial/bundle2.py	Wed Jun 12 11:29:11 2024 +0200
+++ b/mercurial/bundle2.py	Tue Jun 11 18:47:50 2024 +0200
@@ -1788,7 +1788,7 @@
         addpartrevbranchcache(repo, bundler, outgoing)
 
     if opts.get(b'obsolescence', False):
-        obsmarkers = repo.obsstore.relevantmarkers(outgoing.missing)
+        obsmarkers = repo.obsstore.relevantmarkers(nodes=outgoing.missing)
         buildobsmarkerspart(
             bundler,
             obsmarkers,