webdriverio: Inspect not working

Environment (please complete the following information):

• WebdriverIO version: 5.15.7
• Mode: WDIO Testrunner
• If WDIO Testrunner, running sync/async: async
• Node.js version: v10.13.0
• NPM version: 6.7.0
• Browser name and version: Chrome 78.0.3904.108
• Platform name and version: macOs 10.15.1
• Additional wdio packages used (if applicable):@wdio/selenium-standalone

Config of WebdriverIO

exports.config = {
    runner: 'local',
    specs: [
        './test/specs/**/*.ts'
    ],
    exclude: [
        // 'path/to/excluded/files'
    ],
    maxInstances: 10,
    capabilities: [{
       
        maxInstances: 5,
        browserName: 'chrome',
     
    }],
    
    logLevel: 'trace',
    bail: 0,
    baseUrl: 'localhost:8100',
    waitforTimeout: 10000,
    connectionRetryTimeout: 90000,
    connectionRetryCount: 3,
    services: ['selenium-standalone'],
    framework: 'mocha',
    reporters: ['spec'],
    mochaOpts: {
        ui: 'bdd',
        timeout: 60000
    },
    before: function (config, capabilities, specs) {
        require('ts-node').register({
        project: './test/tsconfig.e2e.json'
        });
    },
}

Describe the bug Tried to stop the tests for inspection as written in the official docs The tests are not stopping.

To Reproduce Steps to reproduce the behavior:
./node_modules/.bin/wdio ./test/conf/wdio.conf.js --inspect-brk

Expected behavior The tests stop on the first line.