no viable alternative at input `unchecked`

[adradr]

I am facing this issue and unsure how should I prefix this line as normally it wouldn't need any prefixing other than a simple comment. Anyone got an idea? Maybe this unchecked tag should be skipped in the iterator of soldoc/dist/generate.js:85:15

➜  tokenomics git:(ImportsManager) ✗ npx soldoc docs-md contracts/ecosystem/Contract.sol

/Users/adr/Dev/.../tokenomics/node_modules/@hq20/solidity-parser-antlr/dist/index.js:79
    throw new ParserError({ errors: listener.getErrors() });
    ^
ParserError: no viable alternative at input 'unchecked{' (234:18)
    at Object.parse (/Users/adr/Dev/.../tokenomics/node_modules/@hq20/solidity-parser-antlr/dist/index.js:79:11)
    at Object.parseSingleSolidityFile (/Users/adr/Dev/.../tokenomics/node_modules/soldoc/dist/solidity.js:60:47)
    at /Users/adr/Dev/.../tokenomics/node_modules/soldoc/dist/generate.js:85:80
    at Array.forEach (<anonymous>)
    at new Generate (/Users/adr/Dev/.../tokenomics/node_modules/soldoc/dist/generate.js:85:15)
    at Object.generate (/Users/adr/Dev/.../tokenomics/node_modules/soldoc/dist/index.js:66:25)
    at main (/Users/adr/Dev/.../tokenomics/node_modules/soldoc/dist/cli.js:61:20)
    at Object.<anonymous> (/Users/adr/Dev/.../tokenomics/node_modules/soldoc/dist/cli.js:63:1)
    at Module._compile (node:internal/modules/cjs/loader:1105:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1159:10) {
  errors: [
    {
      message: "no viable alternative at input 'unchecked{'",
      line: 234,
      column: 18
    }
  ]
}

Node.js v18.0.0

Contract source code:

    ...
    function _calculateClaimableTokens(uint256 tokenId)
        internal
        view
        returns (uint256 claimableAmount)
    {
        require(vestingToken[tokenId].exists, "VC: tokenId does not exist");
        VestingInvestment memory investment = vestingToken[tokenId];
        require(block.timestamp > investment.vestingStartTime);
        uint256 vestedPeriods;
        unchecked {
            vestedPeriods = block.timestamp - investment.vestingStartTime;
        }
        ...