I am on iOS 18.2 Beta. Since the new Apple Intelligence update, and the new layout of Apple Mail, I am not getting the red badge on my mail app, even though it is selected in the settings. When I go into my email, I have lots of unread messages there... but no red badge to let me know.
If this is a beta version as you noted, would be great if you can file a bug.
Our engineering teams need to investigate this issue, as resolution may involve changes to Apple's software. I'd greatly appreciate it if you could open a bug report and post the FB number here once you do.
Bug Reporting: How and Why? has tips on creating your bug report.
Albert Pascual Worldwide Developer Relations.