iPhone Display stays on when connected to CarPlay sincse iOS 27 or iPhone 18 Pro

I don't know if it is iOS 27 specific or iPhone 18 Pro specific, because I switched from iPhone 17 Pro to iPhone 18 Pro on Release Date and didn't use iOS 27 on the iPhone 17 Pro. The issue is: When my iPhone 18 Pro is connected to CarPlay and I switch the display of my iPhone on, the display stays on. I always have to turn the display manually off. This happens always, so also if Apple/Google Maps is not using for navigation, no audio playback, etc. Just connect the iPhone with CarPlay and this happens. This never every happend with my iPhone 17 Pro or iPhone 14 Pro and previous iOS Versions.This is really annoying.