iOS 18 CoreBluetooth scanForPeripherals method with a defined CBUUID is not detecting iPhone peripherals advertising in the background state

Question

The Issue

iOS 18 CoreBluetooth - scanForPeripherals method with a defined CBUUID is not detecting iPhone peripherals advertising in the background state.

Setup

• iPhone A (peripheral) - Advertising a service with a specific CBUUID myServiceUUID
• iPhone B (central) - Scanning using the method sCentralManager.scanForPeripherals(withServices: [myServiceUUID])

Test Cases

1. iPhone B (with iOS 18) - detects iPhone A in the foreground state (app open in the foreground)
2. iPhone B (with iOS 18) - FAILS TO detect iPhone A in the background state (app in background; not terminated)
3. iPhone B (with iOS 17 and below) - detects iPhone A in both foreground and background states

FYI

• iPhone A could be any version of iOS
• Test Case 2 is the ISSUE!

Update - Fix

I posted this issue on Apple Feedback Assistant and it was resolved in an iOS update.

https://feedbackassistant.apple.com/feedback/15217942