logIndex changes after block becomes safe

[varasev]

On Nethermind 1.27.0 (and Sepolia chain) we discovered the following behaviour: eth_getFilterChanges returns incorrect logIndex for logs in unfinalized blocks. After block is finalized, the logIndex becomes correct. We don't see the same on Erigon.

For example, I caught that for this transaction and a log with topic 0xb3813568d9991fc951961fcb4c784893574240a28925604d09fc577c55bb7c32 the output was as follows:

  "address" => "0x65ea1489741a5d72ffdd8e6485b216bbdcc15af3",
  "blockHash" => "0xa262b5b296c8fd026516a815a0070096e4285535199af1349f695d47ee24fec4",
  "blockNumber" => "0x6bbf94",
  "data" => "0x0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000020d00000000000000000000000000000000000000000000000000038d7ea4c6800000000000000000000000000000000000000000000000000000038d7ea4c680000000000000077f2e00d764ad0b0001000000000000000000000000000000000000000000000000000000113fa70000000000000000000000005f5a404a5edabcdd80db05e8e54a78c9ebf000c2000000000000000000000000420000000000000000000000000000000000001000000000000000000000000000000000000000000000000000038d7ea4c680000000000000000000000000000000000000000000000000000000000000030d4000000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000000c41635f5fd000000000000000000000000ecb06f2cc720626619821efee4bda42898b39c42000000000000000000000000ecb06f2cc720626619821efee4bda42898b39c4200000000000000000000000000000000000000000000000000038d7ea4c680000000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000b73757065726272696467650000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
  "logIndex" => "0xbc85a",
  "removed" => false,
  "topics" => ["0xb3813568d9991fc951961fcb4c784893574240a28925604d09fc577c55bb7c32", "0x0000000000000000000000001295245d202724dc28a2b688952cb56c882c3380", "0x0000000000000000000000004200000000000000000000000000000000000007", "0x0000000000000000000000000000000000000000000000000000000000000000"],
  "transactionHash" => "0xb7f1fe65f346fb79515153c0f080fc2bb62cf8a1e33fcf0366ca0b6c83d3b8af",
  "transactionIndex" => "0x49",
  "transactionLogIndex" => "0x2"

After block is finalized, eth_getLogs returned another (correct) value:

  "address" => "0x65ea1489741a5d72ffdd8e6485b216bbdcc15af3",
  "blockHash" => "0xa262b5b296c8fd026516a815a0070096e4285535199af1349f695d47ee24fec4",
  "blockNumber" => "0x6bbf94",
  "data" => "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",
  "logIndex" => "0x6e",
  "removed" => false,
  "topics" => ["0xb3813568d9991fc951961fcb4c784893574240a28925604d09fc577c55bb7c32", "0x0000000000000000000000001295245d202724dc28a2b688952cb56c882c3380", "0x0000000000000000000000004200000000000000000000000000000000000007", "0x0000000000000000000000000000000000000000000000000000000000000000"],
  "transactionHash" => "0xb7f1fe65f346fb79515153c0f080fc2bb62cf8a1e33fcf0366ca0b6c83d3b8af",
  "transactionIndex" => "0x49",
  "transactionLogIndex" => "0x2"

[varasev]

Also, eth_newFilter with toBlock parameter equal to safe scans logs prior to the latest block, not the safe one.