Prevent
2021-03-27T00:05:23.382+0300 WARN blockQueue: failed adding block into the blockchain {"error": "error while trying to apply MPT changes: key not found", "blockHeight": 12757, "nextIndex": 12758}
after node restart (node reads "local" root hash that it doesn't have).
It was completely ruined by bf20db09e0. MPT was
updating bc.dao directly which shouldn't ever happen, it must write into the
same cache and then Persist these KVs as usual.
