Pool is not recovered after node restored

install client and node in one machine from rc repo;

run 4 nodes locally as described https://github.com/sovrin-foundation/sovrin-node/blob/master/docs/Sovrin_Running_Locally.md;

on running node1 and node2 delete pool ledger file 

~.sovrin/data/nodes/Node1/pool_transactions_sandbox/1

~.sovrin/data/nodes/Node2/pool_transactions_sandbox/1

stop and rerun node1 and node2;

run load_test.py - it fails as expected;

restore node2 pool ledger file

~.sovrin/data/nodes/Node2/pool_transactions_sandbox/1

rerun node2

run load_test.py - it fails again;