diff -r e1ee6910f6bc -r 3ea3767c23a4 mercurial/store.py
--- a/mercurial/store.py	Sat May 27 04:01:17 2023 +0200
+++ b/mercurial/store.py	Mon May 29 13:28:33 2023 +0200
@@ -554,7 +554,7 @@
         if self.is_changelog:
             return changelog.changelog(repo.svfs)
         elif self.is_manifestlog:
-            mandir = self.target_id.rstrip(b'/')
+            mandir = self.target_id
             return manifest.manifestrevlog(
                 repo.nodeconstants, repo.svfs, tree=mandir
             )