Interestingly this behaviour also applies to the chrome settings itself (also dev tools), but I can select and copy the "hidden" text and paste it sucessfully:
I tried to run selenium-standalone via selenium-standalone start, this runs selenium-standalone version 3.8.1 and ChromeDriver 2.37.544337 and also with latest selenium-standalone version 3.12.0 and ChromeDriver 2.4.0 downloaded, started manually via java -Dwebdriver.chrome.driver=chromedriver -jar selenium-server-standalone-3.12.0.jar, it did not changed the result that Chrome hides all text visually.
I am on Mac OS X 10.13.5.
What else can I do to troubleshoot & fix the issue?
I am unsure where to ask this question since I am not sure which part of the stack is causing the problem.
Please note: This is a cross post of https://stackoverflow.com/questions/50833492/automated-chrome-hides-text-in-codeceptjs-webdriverio-test