"The referenced script (Unknown) on this Behaviour is missing!" warnings are logged when entering the Play mode in the Environment sample scene

How to reproduce:
1. Create a new HDRP project
2. Go to Window -> Package Management -> Package Manager (Window -> Package Manager) -> High Definition RP -> Samples -> Environment Samples -> Import
3. Go to -> Assets -> Samples -> High Definition RP -> 17.1.0 -> Environment Samples -> Environment.unity
4. Enter the Play mode
5. Observe the Console

Expected results: No warnings are thrown
Actual results: Two warnings "The referenced script (Unknown) on this Behaviour is missing!" are thrown

Reproducible with: 6000.0.46f1, 6000.1.0b15, 6000.2.0a9

Reproducible on: macOS Sequoia 15.3 (M1)
Not reproducible on: No other environment tested