Bugfix: ensure consistency of m_failed_blocks after reconsiderblock
Bugfix: ensure consistency of m_failed_blocks after reconsiderblock

Github-Pull: #13199
Rebased-From: 11fa6bb66e8c1562305d034903a0dc6aee6eea20

chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin