Wallaby test configuration with env.params.env – there seems to be a problem with comma-separated env variables

wallaby.js

const babel = require("babel");
    
module.exports = function () {
    return {
        files: [
            "app/**/*.js"
        ],

        tests: [
            "test/app/**/*-test.js"
        ],

        preprocessors: {
            "**/*.js": file => babel.transform(file.content, {
                sourceMap: true
            })
        },

        env: {
            type: "node",
            runner: "node",
            params: {

                // THIS WORKS:
                env: "advertising-service.endpoint=http://10.44.229.1:36101/adv/"

                // THIS DOESN'T WORK:
                //env: "foo=bar,advertising-service.endpoint=http://10.44.229.1:36101/adv/"
            }
        },

        workers: {
            recycle: true
        }
    };
};