[BUG] When stress testing in localnet, I find some different L2 block have the same timestamp ?

[lyh169]

when i stree testing, there have probability the different L2 block have the same timestamp.。

the log as follows

the block of 62 is as follows:
{ "jsonrpc": "2.0", "id": 1, "result": { "parentHash": "0x4505c38054bf7513c6fedc1bedf68145ff7d7c889492ecdb984e5d882673d900", "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347", "miner": "0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266", "stateRoot": "0x58354543fd1049901c75a23a2b70e3c013a7ae1b88b9224a1a2c3d98b42aeda7", "transactionsRoot": "0xa0377fb2b2af4ce63dca3bf99cdedbc216f290826960cfbe2a6df4f29cf8216d", "receiptsRoot": "0x84cd6ea60cefffe0982e6df603133a2b17c64938930bba7a3491789d261618e8", "logsBloom": "0x00000008840001000080400240000000004200000005010000000000201802000000000840000200000000000000000000000008000040800000004000000000308020800000000008010008000400440000001008000010000000000100000020000000000000000180000000000000000400000000000000a020100000001000000000005000000000004040080000000010004000000000000000000100000000040000100800000000000000000000000000004000000000800000000000080080820010400080a0000040004000000188080000000080100000000000802000008000000020101000000084000000000008080008000000100800100000", "difficulty": "0x0", "totalDifficulty": "0x0", "size": "0xc45", "number": "0x3e", "gasLimit": "0x4000000000000", "gasUsed": "0x82497", "timestamp": "0x667bc656", "extraData": "0x", "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000", "nonce": "0x0000000000000000", "hash": "0xdf2c8db96d6e671b13050254dfdb32928cf57d727803bd59629f8fde21792e33", ......... } }

the block of 63 is as follows:
{ "jsonrpc": "2.0", "id": 1, "result": { "parentHash": "0xdf2c8db96d6e671b13050254dfdb32928cf57d727803bd59629f8fde21792e33", "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347", "miner": "0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266", "stateRoot": "0xe3879c0822c85b437e0fac91fa2a5c728b3436feee92c9b98c5689de1c72137b", "transactionsRoot": "0x80dbb956f8852c6409b2e6e499d643d6f6bccd0e0a9334bbc9d8d3c33aaf09fe", "receiptsRoot": "0x58560235c9b8022ef3985c818392f023230cc49a3b127f2c963749fa2251276b", "logsBloom": "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", "difficulty": "0x0", "totalDifficulty": "0x0", "size": "0x85ee", "number": "0x3f", "gasLimit": "0x4000000000000", "gasUsed": "0x68c5b9", "timestamp": "0x667bc656", "extraData": "0x", "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000", "nonce": "0x0000000000000000", "hash": "0xcaa1c31ff83e67caf8e120e9e7b52574ee08d3ab264e2720401e8d6f26678e50", ......... } }

There is a same timestamp between the block 62 and 63。