--- a/mercurial/localrepo.py	Tue Mar 14 14:08:38 2023 +0000
+++ b/mercurial/localrepo.py	Wed Mar 15 05:49:56 2023 +0100
@@ -2951,6 +2951,7 @@
         known good state)."""
         unfi = self.unfiltered()
         if 'dirstate' in unfi.__dict__:
+            assert not self.dirstate.is_changing_any
             del unfi.__dict__['dirstate']
 
     def invalidate(self, clearfilecache=False):