--- a/mercurial/merge.py	Tue Jan 18 15:04:55 2022 -0800
+++ b/mercurial/merge.py	Tue Jan 18 13:23:49 2022 -0800
@@ -2280,7 +2280,7 @@
         ctx.rev(),
         branchmerge=False,
         force=False,
-        labels=[b'working copy', b'destination'],
+        labels=[b'working copy', b'destination', b'working copy parent'],
         updatecheck=updatecheck,
         wc=wc,
     )