When using iCloud account with push in Apple mail app. The badge number of unread email is not syncing across devices. If I read an email on my iPhone my iPad mail app badge won’t update until I click into the app and wait for the update. Is there any fix of this?

in the IOS18.1 release when using Apple Intelligence the notifications will be delayed around 10 second. Even without the notification summary turned on. It seems to be a system-wide bug, anyway to fix it or bypass it.