Mining upon a base with early block cause " weight draw", is this expected?

[ricktian1226]

miner tried to mine on 904463 as follow:
2021-07-05T07:11:11.247+0800 ^[[34mINFO^[[0m miner miner/miner.go:646 completed mineOne {"tookMilliseconds": 5164, "forRound": 904463, "baseEpoch": 904461, "baseDeltaSeconds": 36, "nullRounds": 1, "lateStart": false, "beaconEpoch": 1000307, "lookbackEpochs": 900, "networkPowerAtLookback": "8095175825230954496", "minerPowerAtLookback": "1396792084135936", "isEligible": true, "isWinner": true, "error": null}

Attention to "baseDeltaSeconds": 36 . When miner mine 904463, the base it calculate on is 904461. And lotus encouters "weight draw", block was abandoned...

2021-07-05T07:11:30.125+0800 ^[[31mERROR^[[0m chainstore store/store.go:414 weight draw {"currTs": "[bafy2bzaceaxvae7ubj2k7stanbtax64wgou7vvdqyjgm7msuolkq2x7suyd4i]", "ts": "[bafy2bzacea7gtbjewlomps3c7tn5puw7hrx7cqedyq67zebooqqrzgu5h7p34]"}

The question is : Is it correct to mine 904463 base on 904461? I think the result will always be abandoned.

[LexLuthr]

Hi @ricktian1226 , do you still need help with this?