diff -r af303ae33cd7 -r 0b3f3a3ca50a mercurial/pure/parsers.py
--- a/mercurial/pure/parsers.py	Wed Nov 24 04:51:05 2021 +0100
+++ b/mercurial/pure/parsers.py	Wed Nov 24 04:59:48 2021 +0100
@@ -551,6 +551,8 @@
             return AMBIGUOUS_TIME
         elif not self._p1_tracked:
             return AMBIGUOUS_TIME
+        elif self._mtime_second_ambiguous:
+            return AMBIGUOUS_TIME
         else:
             return self._mtime_s