If anything wrong happens after a transaction is locked and before the end of
onTransactionCommitted, recovery phase should be run again, so that the master
gets correct last tid.

Following patch by Vincent is an attempt to fix this:

--- a/neo/master/app.py
+++ b/neo/master/app.py
@@ -329,8 +329,8 @@ def playPrimaryRole(self):

         # recover the cluster status at startup
         try:
-            self.runManager(RecoveryManager)
             while True:
+                self.runManager(RecoveryManager)
                 self.runManager(VerificationManager)
                 try:
                     if self.backup_tid:
@@ -338,10 +338,6 @@ def playPrimaryRole(self):
                             raise RuntimeError("No upstream cluster to backup"
                                                " defined in configuration")
                         self.backup_app.provideService()
-                        # Reset connection with storages (and go through a
-                        # recovery phase) when leaving backup mode in order
-                        # to get correct last oid/tid.
-                        self.runManager(RecoveryManager)
                         continue
                     self.provideService()
                 except OperationFailure: