“The referenced script (Unknown) on this Behaviour is missing!” Warnings thrown when entering Play mode in “AdvancedVehicleScene” in HDRP Template

How to reproduce:
1. Create new Unity project using High Definition 3D Template
2. Open Package Manager, install com.unity.vehicles package and import Samples
3. In Project window navigate to Assets > Samples > Vehicles > 0.1.0-exp.5 > Advanced Vehicles Sample > Scenes and open AdvancedVehiclesScene.unity scene
4. Enter Play mode and observe the Console window

Actual result: Warnings - The referenced script (Unknown) on this Behaviour is missing! - are thrown in the Console

Expected result: No warnings are thrown in the Console

Reproducible with: 0.1.0-exp.5 (6000.2.0b1)

Tested on (OS): MacBook Pro, 2021 (M1), Sequoia 15.3.2