Unexpected nil withdrawals on Shanghai enabled

[AnnaShaleva]

System information

Commit hash : 72ab401, after #122 merge.

Expected behaviour

Withdrawals are always non-nil and empty if Shanghai is enabled from 0.

Actual behaviour

Sometimes withdrawals are nil in the RPC node.
node8.log

Steps to reproduce the behaviour

Discovered by @nicolegys on 7-nodes privnet.

[nicolegys]

My genesis configuration file.

genesis_privnet.json

{
  "config": {
    "chainId": 2312251829,
    "homesteadBlock": 0,
    "eip150Block": 0,
    "eip155Block": 0,
    "eip158Block": 0,
    "byzantiumBlock": 0,
    "constantinopleBlock": 0,
    "petersburgBlock": 0,
    "istanbulBlock": 0,
    "muirGlacierBlock": 0,
    "berlinBlock": 0,
    "londonBlock": 0,
    "arrowGlacierBlock": 0,
    "grayGlacierBlock": 0,
    "shanghaiTime": 0,
    "dbft": {
      "period": 10,
      "standbyValidators":[
        "0x74f4effb0b538baec703346b03b6d9292f53a4cd",
        "0x910ad1641b7125eff746accdca1f11148b22f472",
        "0xfef5f250af14df73f983caab7b1f5002189c42e0",
        "0xc51964013acbc6b271feecb0febd9e7a01202930",
        "0xc5bbd9652546bc96be3dec97a38ee335f7873dfa",
        "0x26f1794b81df2b832545b8b6bbca196b82e4feb1",
        "0x0b51369d02e47ee3f143391b837aa08c31aaa19b"
      ],
      "coinbase": "0x1212100000000000000000000000000000000003"
    }
  },
  "difficulty": "1",
  "gasLimit": "30000000",
  "alloc": {
    "74f4effb0b538baec703346b03b6d9292f53a4cd": { "balance": "100000000000000000000000" },
    "910ad1641b7125eff746accdca1f11148b22f472": { "balance": "100000000000000000000" },
    "fef5f250af14df73f983caab7b1f5002189c42e0": { "balance": "100000000000000000000" },
    "c51964013acbc6b271feecb0febd9e7a01202930": { "balance": "100000000000000000000" },
    "c5bbd9652546bc96be3dec97a38ee335f7873dfa": { "balance": "100000000000000000000" },
    "26f1794b81df2b832545b8b6bbca196b82e4feb1": { "balance": "100000000000000000000" },
    "0b51369d02e47ee3f143391b837aa08c31aaa19b": { "balance": "100000000000000000000" },
    "1212100000000000000000000000000000000004": {
      "balance": "100000000000000000000000",
      "code": 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      "storage": {
          "0x0000000000000000000000000000000000000000000000000000000000000005": "0x0f467b64b0f970e63994fe8a120410151cc094db",
          "0x0000000000000000000000000000000000000000000000000000000000000000": "0x07",
          "0x0000000000000000000000000000000000000000000000000000000000000004": "0xbb03c5030cac72e290ae185a8b9b375c58f7a9a6",
          "0x290decd9548b62a8d60345a988386fc84ba6bc95484008f6362f93160ef3e567": "0x97fb9c893c19da2672dbd790ac9fc406f138584b",
          "0x290decd9548b62a8d60345a988386fc84ba6bc95484008f6362f93160ef3e569": "0x394831b50e496a4e85c97acdbd7943802d897c34",
          "0x0000000000000000000000000000000000000000000000000000000000000003": "0x640500000000000000000000000000000000",
          "0x0000000000000000000000000000000000000000000000000000000000000006": "0xe7715472792d680ab4c5837e2131264a6153c89d",
          "0x290decd9548b62a8d60345a988386fc84ba6bc95484008f6362f93160ef3e563": "0xf82cf7e2b899a57d22653a6a742c0c60523d6a61",
          "0x290decd9548b62a8d60345a988386fc84ba6bc95484008f6362f93160ef3e568": "0xb93ce875656d56935da316b27860b0fc7b60435a",
          "0x290decd9548b62a8d60345a988386fc84ba6bc95484008f6362f93160ef3e565": "0x58e479a056df6d54600b4e02b8eb6390bcd8a550",
          "0x290decd9548b62a8d60345a988386fc84ba6bc95484008f6362f93160ef3e566": "0x3a6eabc45ac029ccfaf49d54593a996f638e7cf7",
          "0x290decd9548b62a8d60345a988386fc84ba6bc95484008f6362f93160ef3e564": "0xb42fbb03f30424aa903022269fcd62eabbdfcfae"
      }
    }
  }
}

CNs logs
7cn_cn1.log
7cn_cn2.log
7cn_cn3.log
7cn_cn4.log
7cn_cn5.log
7cn_cn6.log
7cn_cn7.log