Webpack 4 and less 3 issues

[devil9108]

Getting below issue after adding the antd-scss-theme-plugin to our project.
we are using wepack: 4.40.2, less: 3.10.3, less-loader: 5.0.0, antd: 3.23.4

At first got the below error

`position: absolute;
top: 8px + @font-size-base * @line-height-base / 2 - @font-size-base / 2;`

After adding strictMath: true above error resolved.

After that got the below error

 &-loading-icon {
      .iconfont-size-under-12px(10px);
    ^
Error evaluating function `unit`: the first argument to unit must be a number. Have you forgotten parenthesis?
      in D:\Phoenix-spa\node_modules\antd\lib\cascader\style\index.less (line 217, column 6)

Its not resolving. Any one please help me on this.

At present my plugin code is like below

AntdScssThemePlugin.themify({
	loader: 'less-loader',
	options: {
		javascriptEnabled: true,
		strictMath: true,
		sourceMap: isEnvProduction && shouldUseSourceMap
	}
})