Repro steps:
1. Open an HDRP project
2. Create a new Global Volume or select an existing one in the scene
3. Add a 'Lift, Gamma, Gain' post-processing effect.
4. Observe the errors:

UnityException: FindShaderByName is not allowed to be called from a ScriptableObject constructor (or instance field initializer), call it in OnEnable instead. Called from ScriptableObject 'ShadowsMidtonesHighlightsEditor'.
See "Script Serialization" page in the Unity Manual for further details.

NullReferenceException: Object reference not set to an instance of an object
UnityEngine.Rendering.VolumeComponent.FindParameters (System.Object o, System.Collections.Generic.List`1[T] parameters, System.Func`2[T,TResult] filter) (at D:/Projects/VFX/SRP - Other/com.unity.render-pipelines.core/Runtime/Volume/VolumeComponent.cs:151)
UnityEditor.Rendering.VolumeComponentEditor.InitParameters () (at D:/Projects/VFX/SRP - Other/com.unity.render-pipelines.core/Editor/Volume/VolumeComponentEditor.cs:245)

Notes:
- Affected effects: 'Lift, Gamma, Gain' and 'Shadows, Midtones, Highlights'
- Tried all other volume overrides (post processing, lighting, etc.); they add fine
- Happens in latest HDRP master, works fine in the latest public version
- Volumes which already had these overrides are rendered useless if selected as no overrides are drawn