diff -r cb52e619c99e -r 7f5410dfc8a6 mercurial/dirstate.py
--- a/mercurial/dirstate.py	Thu Jan 30 19:16:12 2020 +0100
+++ b/mercurial/dirstate.py	Wed Jan 29 11:11:18 2020 +0100
@@ -1849,7 +1849,7 @@
             nonnorm, otherparents = self._rustmap.nonnormalentries()
             return nonnorm
 
-        @property
+        @propertycache
         def otherparentset(self):
             nonnorm, otherparents = self._rustmap.nonnormalentries()
             return otherparents