Bug [ExecuteAlways] doesn't always work

I've got two classes that are identical other than name and an irrelevant enum:

Code (CSharp):

1. using System.Collections.Generic;
2. using UnityEngine;
3. [ExecuteAlways]
4. public class SpeedometerNeedle : MonoBehaviour
5. {
6.     SpinnerType spinnerType = SpinnerType.SpeedometerNeedle;
7.  
8.     Spinner spinner = new Spinner();
9.     public SpinnerSpinAxis spinAxis = SpinnerSpinAxis.Z;
10.     public List<MeshFilter> meshFilters = new List<MeshFilter>();
11.     public NeedleParams needleParams = new NeedleParams();
12.  
13.  
14.     private void OnRenderObject()
15.     {
16.         if (needleParams.copyToTransform)
17.             needleParams.copyToTransform.rotation = transform.rotation;
18.  
19.         needleParams.WriteToSpinner(spinner, spinnerType, spinAxis, transform);
20.     }
21.  
22. }

Code (CSharp):

1. using System.Collections.Generic;
2. using UnityEngine;
3. [ExecuteAlways]
4. public class TachometerNeedle : MonoBehaviour
5. {
6.     SpinnerType spinnerType = SpinnerType.TachometerNeedle;
7.  
8.     Spinner spinner = new Spinner();
9.     public SpinnerSpinAxis spinAxis = SpinnerSpinAxis.Z;
10.     public List<MeshFilter> meshFilters = new List<MeshFilter>();
11.     public NeedleParams needleParams = new NeedleParams();
12.  
13.     private void OnRenderObject()
14.     {
15.         if (needleParams.copyToTransform)
16.             needleParams.copyToTransform.rotation = transform.rotation;
17.  
18.         needleParams.WriteToSpinner(spinner, spinnerType, spinAxis, transform);
19.     }
20. }
21.  

These are tagged as [ExecuteAlways] but only one of them is working. If I stick a breakpoint in OnRenderObject() on both classes, the SpeedometerNeedle one gets hit but the TachometerNeedle one doesn't. It worked yesterday, but not today. This was a problem in 2020 version so I updated to 2022.1.10f1, but it still doesn't work.

Why?

 

At all? Or just not continuously?

If you look at ExecuteAlways docs, it specifically says that method only gets called when the Scene or Game windows gets a paint message.

https://docs.unity3d.com/ScriptReference/ExecuteAlways.html

 

At all. One always works, the other never does. Yesterday they both worked fine.