"eth.getBlock('Pending')" request returns 0 instead of transactions that will be included in the next block

[oleksandrSydorenkoJ]

Describe the bug
Due to the block mining time in Skaled and for optimizing performance costs, Skaled has reduced the usage of the 'pending' tag in the 'eth_getBlockByNumber' JSON-RPC call, resulting in some behavior differences from Ethereum.
This issue is also relevant for other JSON-RPC calls, such as eth_getBlockByNumber, eth_getBlockTransactionCountByNumber, eth_getTransactionByBlockNumberAndIndex, etc where the "pending" tag used.

Versions
Skaled: 3.18.0

Environment:
Active Schain medium type 16 nodes
Endpoint to Schain
Adress with Sfuel on balance

To Reproduce

1. Send transaction sfuel transfer to schain
2. Send eth.getBlock('pending') call to the chain until the transaction mined and save the block number NNN
3. Check block with call eth.getBlock(NNN)

Expected behavior
The pending block should contain pending transactions from the next block.

Actual state:
The pending block always contains 0 transactions

Logs

> eth.getBlock('pending')
{
  author: "0xd2ba3e0000000000000000000000000000000000",
  boundary: "0x0000000000000000000000000000000000000000000000000000000000000000",
  difficulty: 0,
  extraData: "0x",
  gasLimit: 268435455,
  gasUsed: 0,
  hash: "0x8637a60b42c801fbdc283fe8a992fb8b6a41a09dd6fe8ade3bf66425a84a1b8d",
  logsBloom: "",
  miner: "0xd2ba3e0000000000000000000000000000000000",
  mixHash: "0x0000000000000000000000000000000000000000000000000000000000000000",
  nonce: "0x0000000000000000",
  number: 1111346,
  parentHash: "0x7e320f344b4d17932d3ef518a1ee50aecec4127d35195fb63ab33406b982fca3",
  receiptsRoot: "0x0000000000000000000000000000000000000000000000000000000000000000",
  seedHash: "0xeada66563356d409600b12a514e79a41ce5763fcf7928810226e3dce57fb9668",
  sha3Uncles: "0x0000000000000000000000000000000000000000000000000000000000000000",
  size: 0,
  stateRoot: "0xabccb81fdac5f5048001e41e60ec001da6fd219047eddfd8e8fed6995246bfd9",
  timestamp: 1710164722,
  totalDifficulty: 1.15792089237316195423570985008687907853269984665640564039457584007913129639935e+77,
  transactions: [],
  transactionsRoot: "0x0000000000000000000000000000000000000000000000000000000000000000",
  uncles: []
}

> eth.getBlock('latest')
{
  author: "0xd2ba3e0000000000000000000000000000000000",
  boundary: "0x0000000000000000000000000000000000000000000000000000000000000000",
  difficulty: 0,
  extraData: "0x736b616c65",
  gasLimit: 268435455,
  gasUsed: 21000,
  hash: "0x1d1688008f1fc1c13fdb664afc9f1c0c417478c0d1bcdb526c8025cf34281ae4",
  logsBloom: "",
  miner: "0xd2ba3e0000000000000000000000000000000000",
  mixHash: "0x0000000000000000000000000000000000000000000000000000000000000000",
  nonce: "0x0000000000000000",
  number: 1111346,
  parentHash: "0x7e320f344b4d17932d3ef518a1ee50aecec4127d35195fb63ab33406b982fca3",
  receiptsRoot: "0x056b23fbba480696b65fe5a59b8f2148a1299103c4f57df839233af2cf4ca2d2",
  seedHash: "0xeada66563356d409600b12a514e79a41ce5763fcf7928810226e3dce57fb9668",
  sha3Uncles: "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
  size: 582,
  stateRoot: "0xabccb81fdac5f5048001e41e60ec001da6fd219047eddfd8e8fed6995246bfd9",
  timestamp: 1710164721,
  totalDifficulty: 0,
  transactions: ["0xf6a858e551f915378b93a98196c214bbc2aa840a9c4ed8783694d4e0c969c8d5"],
  transactionsRoot: "0xa4547dc7bad7706cbd14a521df5a92df961305315ff6b25a85eda524992bbb50",
  uncles: []
}