Brand new Pixel feature already has bugs; Google says that a fix is coming

Both iOS and Android added a system-wide Dark Mode toggle to iOS 13 and Android 10 respectively. When enabled, this feature inverts the typical UI of black text on a white background and changes it to white text on a black background. This prevents users and bystanders from having their retinas melted by the blinding white background at night or in a dark room. Dark Mode can also improve the battery life of a phone sporting an AMOLED display. That’s because such screens are not backlit and create the color black by turning off the appropriate pixels; pixels that are turned off do not create a draw on a device’s battery. And there are some people who just like the look of Dark Mode on their phone.
Bug prevents Pixel owners from scheduling Dark Mode on certain Google apps
If you are the impatient type and can’t wait for Google to fix the issue, some Redditors have posted a workaround, at least for the Gboard app. If you become a beta tester for the app, the bug is said to be exterminated allowing you to schedule Dark Mode for Google’s Android keyboard application. To join the Gboard beta program, open the Google Play Store and tap on the hamburger menu found on the left side of the search field. Select My apps & games. Go the Installed tab and look for Gboard. After finding Gboard, tap on it and scroll down to the section just under Developer contact; if you’re not already a beta tester for the app, you will see directions on how to join. If you are a beta tester, it will clearly state so.
Again, if you don’t want to go through all of this just to be able to schedule Dark Mode on Gboard, you can wait for Google to disseminate the fix which will also exterminate the bug preventing Pixel users from scheduling Dark Mode for the Contacts and Dialer apps.