indy-node 1.2.50 (rc)
Steps to Reproduce:
1. Install pool of 4 nodes.
2. Run load tests to fill ledger with ~9000 txns.
3. Add the 5th node.
4. Send NYM txn.
5. Add the 6th node.
6. Send NYM.
7. Get NYM.
Both nodes catches up successfully but NYM from Step 6 is not added (but GET_NYM command from Step 7 still works).
Pool should work normally after both nodes adding.
Restart at least 4 nodes of 6 to return the pool to valid state.
The issue is not reproducing with small ledger pool.