notification iOS

I'm using the flutter_local_notificationspackage to display notifications in and outside the app (background mode). Everything is working as expected on Android (debug + release) and iOS debug mode but, strangely, local notifications are not displayed in background mode for iOS release.

I don't know why the iOS release mode behaves differently, any thoughts?

Thanks.

What I already checked:

use of the latest version of the flutter_local_notifications package (v16.1.0) checking "Signing & Capabilities" for both debug and release mode (Background modes : fetch, remote notifications)