diff -r ecf6d7aa874b -r 0428978bca22 mercurial/debugcommands.py
--- a/mercurial/debugcommands.py	Tue Oct 06 19:11:34 2020 +0530
+++ b/mercurial/debugcommands.py	Sat Oct 10 12:43:04 2020 +0530
@@ -2107,7 +2107,7 @@
     fm_files.end()
 
     fm_extras = fm.nested(b'extras')
-    for f, d in sorted(pycompat.iteritems(ms._stateextras)):
+    for f, d in sorted(pycompat.iteritems(ms.allextras())):
         if f in ms:
             # If file is in mergestate, we have already processed it's extras
             continue