--- a/mercurial/pure/parsers.py	Wed Nov 24 04:59:48 2021 +0100
+++ b/mercurial/pure/parsers.py	Wed Nov 24 05:00:06 2021 +0100
@@ -483,6 +483,8 @@
                 flags |= DIRSTATE_V2_MODE_IS_SYMLINK
         if self._mtime_s is not None:
             flags |= DIRSTATE_V2_HAS_MTIME
+        if self._mtime_second_ambiguous:
+            flags |= DIRSTATE_V2_MTIME_SECOND_AMBIGUOUS
 
         if self._fallback_exec is not None:
             flags |= DIRSTATE_V2_HAS_FALLBACK_EXEC