mercurial/exchange.py

--- a/mercurial/exchange.py	Wed Aug 16 15:48:48 2017 -0700
+++ b/mercurial/exchange.py	Thu Aug 17 13:04:47 2017 -0700
@@ -1401,6 +1401,10 @@
     if pullop.fetch:
         pullop.cgresult = bundle2.combinechangegroupresults(op)
 
+    # If the bundle had a phase-heads part, then phase exchange is already done
+    if op.records['phase-heads']:
+        pullop.stepsdone.add('phases')
+
     # processing phases change
     for namespace, value in op.records['listkeys']:
         if namespace == 'phases':