--- a/mercurial/repair.py	Fri Feb 23 04:26:03 2024 +0100
+++ b/mercurial/repair.py	Tue Feb 20 14:21:18 2024 +0100
@@ -218,6 +218,7 @@
                 oldfiles = set(tr._offsetmap.keys())
                 oldfiles.update(tr._newfiles)
 
+                repo._phasecache.register_strip(repo, tr, striprev)
                 tr.startgroup()
                 cl.strip(striprev, tr)
                 stripmanifest(repo, striprev, tr, files)
@@ -239,7 +240,6 @@
                 deleteobsmarkers(repo.obsstore, stripobsidx)
                 del repo.obsstore
                 repo.invalidatevolatilesets()
-                repo._phasecache.filterunknown(repo)
 
             if tmpbundlefile:
                 ui.note(_(b"adding branch\n"))