Error if string in constructor

[mypeaceduck]

Hello, in testnet using remix.ethereum.org

Without errors:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract CustomToken {
    uint256 public name;
    uint256 public symbol;
    constructor(uint256 _name, uint256 _symbol) {
        name = _name;
        symbol = _symbol;
    }
}

contract SimpleStorage {
    constructor() {}
    function create() public returns(address) {
        CustomToken t = new CustomToken(11,22);
        return address(t); 
    }
}

With errors:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract CustomToken {
    string public name;
    uint256 public symbol;
    constructor(string memory _name, uint256 _symbol) {
        name = _name;
        symbol = _symbol;
    }
}

contract SimpleStorage {
    constructor() {}
    function create() public returns(address) {
        CustomToken t = new CustomToken("11",22);
        return address(t); 
    }
}

[mypeaceduck]

Gas estimation errored with the following message (see below). The transaction execution will likely fail. Do you want to force sending?
Error happened while trying to execute a function inside a smart contract
Eip838ExecutionError: failed to estimate gas: message execution failed: exit 35, revert reason: none, vm error: message failed with backtrace:
00: f010 (method 4) -- send aborted with code 35 (35)
01: f01 (method 3) -- constructor failed: send aborted with code 35 (35)
02: f0121008 (method 1) -- ABORT(pc=291): undefined instruction (35)
(RetCode=35)

[longfeiWan9]

@mypeaceduck This issue happens for the latest solidity compiler (0.8.26), so I guess you compiled your smart contract with the solidity compiler (0.8.26). We think it very likely related to the MCOPY introduced in EIP-5656 for improving memory copy, and our team is working to fix this issue.
Before MCOPY is implemented into FEVM, I suggest you try to compile your smart contract with the solidity compiler (0.8.20).

[wolfduan]

github