Bug HDBakedReflectionSystem warning

What is this poorly worded warning which does not go with a script compile? 2020.3.0 LTS

Code (CSharp):

1. HDBakedReflectionSystem work with HDRP, Either switch your render pipeline or use a different reflection system.
2. You may need to trigger a C# domain reload to initialize the appropriate reflection system. One way to do this is to compile a script.

 

Still occurs 2020.3.4:

Code (CSharp):

1. HDBakedReflectionSystem work with HDRP, Either switch your render pipeline or use a different reflection system. You may need to trigger a C# domain reload to initialize the appropriate reflection system. One way to do this is to compile a script.
2. UnityEngine.StackTraceUtility:ExtractStackTrace ()
3. UnityEngine.DebugLogHandler:LogFormat (UnityEngine.LogType,UnityEngine.Object,string,object[])
4. UnityEngine.Logger:Log (UnityEngine.LogType,object)
5. UnityEngine.Debug:LogWarning (object)
6. UnityEditor.Rendering.HighDefinition.HDBakedReflectionSystem:Tick (UnityEditor.Experimental.Rendering.SceneStateHash,UnityEditor.Experimental.Rendering.IScriptableBakedReflectionSystemStageNotifier) (at Library/PackageCache/com.unity.render-pipelines.high-definition@10.4.0/Editor/Lighting/Reflection/HDBakedReflectionSystem.cs:101)
7. UnityEditor.Experimental.Rendering.ScriptableBakedReflectionSystemWrapper:Internal_ScriptableBakedReflectionSystemWrapper_Tick (UnityEditor.Experimental.Rendering.SceneStateHash)
8.  
9. (Filename: Library/PackageCache/com.unity.render-pipelines.high-definition@10.4.0/Editor/Lighting/Reflection/HDBakedReflectionSystem.cs Line: 101)

 

Im in 2019.4 and getting the same thing.

 

2021.1.10f1 and I also get this

 

You have to have a full-cycle rendered before attempting to bake
ie run enter play mode, come out, save then bake.
some cache data must be built first, or like it says recompile a script.