MaraPool mined an invalid block at 809478 on mainnet. I observed the block on 9 out of 9 nodes.

ERROR: ConnectTip: ConnectBlock 000000000000000000006840568a01091022093a176d12a1e8e5e261e4f11853 failed, bad-txns-inputs-missingorspent, CheckTxInputs: inputs missing/spent