Google left months-old dark mode bug in Android 16, fix planned for next Pixel Drop
Despite introducing the bug in March, it may be September before Google fixes it.

Google's Pixel phones got a big update this week with the release of Android 16 and a batch of Pixel Drop features. Pixels now have enhanced security, new contact features, and improved button navigation. However, some of the most interesting features, like desktop windowing and Material 3 Expressive, are coming later. Another thing that's coming later, it seems, is a fix for an annoying bug Google introduced a few months back.
Google broke the system dark mode schedule in its March Pixel update and did not address it in time for Android 16. The company confirms a fix is coming, though.
The system-level dark theme arrives in Android 10 to offer a less eye-searing option, which is particularly handy in dark environments. It took a while for even Google's apps to fully adopt this feature, but support is solid five years later. Google even offers a scheduling feature to switch between light and dark mode at custom times or based on sunrise/sunset. However, the scheduling feature was busted in the March update.