Less Loader Build Failure Due to Unrecognised Input

[n3g2]

Description: I am encountering a build failure when using the less-loader in my project. The error message points to an unrecognized input in my LESS file. Here are the details:

Error Message:

When I run my webpack build process, it fails with the aforementioned error. Expected Behavior: The build process should compile the LESS file successfully without errors.

Actual Behavior: The build fails, indicating an unrecognized input at the specified line and character.

Additional Information:

Node.js version: v20.10.0 "less": "^3.0.4", "less-loader": "^4.1.0", "webpack": "^4.32.2", Webpack configuration related to less-loader:

{
    test: /.less$/,
    exclude: /\.module\.less$/,
    use: [
        'style-loader',
        {
            loader: 'css-loader',
            options: {
                modules: true,
                localIdentName: '[local]'
            }
        },
        'postcss-loader',
        {
            loader: 'less-loader',
            options: {
                javascriptEnabled: true
            }
        }
    ]
}

I suspect that the 0.9 ![1,4] part is causing the issue as it is not valid LESS syntax. Could this be a typo or unsupported syntax? Any help would be greatly appreciated.

font-size: 9rem ![1,4]; // success
font-size: 0.9rem ![1,4]; // fail

Thank you!