--- a/mercurial/pure/parsers.py	Mon Oct 18 11:23:07 2021 +0200
+++ b/mercurial/pure/parsers.py	Tue Oct 19 22:04:14 2021 +0200
@@ -60,6 +60,7 @@
 DIRSTATE_V2_FALLBACK_EXEC = 1 << 12
 DIRSTATE_V2_HAS_FALLBACK_SYMLINK = 1 << 13
 DIRSTATE_V2_FALLBACK_SYMLINK = 1 << 14
+DIRSTATE_V2_MTIME_SECOND_AMBIGUOUS = 1 << 15
 
 
 @attr.s(slots=True, init=False)
@@ -140,6 +141,10 @@
         """Build a new DirstateItem object from V2 data"""
         has_mode_size = bool(flags & DIRSTATE_V2_HAS_MODE_AND_SIZE)
         has_meaningful_mtime = bool(flags & DIRSTATE_V2_HAS_FILE_MTIME)
+        if flags & DIRSTATE_V2_MTIME_SECOND_AMBIGUOUS:
+            # The current code is not able to do the more subtle comparison that the
+            # MTIME_SECOND_AMBIGUOUS requires. So we ignore the mtime
+            has_meaningful_mtime = False
         mode = None
 
         if flags & +DIRSTATE_V2_EXPECTED_STATE_IS_MODIFIED: