xDB not tracking Custom Facet

Question

Version: Sitecore 9.2

I have followed these tutorials:
- https://himmatsinghdulawat.blogspot.com/2019/06/create-custom-facet-model-in-sitecore-9.html
- How to properly configure a custom facet in Sitecore 9.1
- including Sitecore docs and am not seeing my facet key being saved in xDB.

I have checked and both index worker and automation engine are running.

Here is my implementation:

  [Serializable]
  [FacetKey(DefaultFacetKey)]
  public class ContactFacetExtension : Facet
  {
    public const string DefaultFacetKey = "ContactExt";

    public string Subscribe { get; set; }
    public string Unsubscribe { get; set; }
    public string Property { get; set; }
  }

  public class ContactFacetExtModel
  {
    public static XdbModel Model { get; } = BuildModel();

    private static XdbModel BuildModel()
    {
      XdbModelBuilder modelBuilder = new XdbModelBuilder("ContactFacetExtModel", new XdbModelVersion(0, 1));

      modelBuilder.ReferenceModel(Sitecore.XConnect.Collection.Model.CollectionModel.Model);
      modelBuilder.DefineFacet<Contact, ContactFacetExtension>(ContactFacetExtension.DefaultFacetKey);

      return modelBuilder.BuildModel();
    }
  }

I have placed this in my
- C:\xconnect root\App_Data\Models &
- C:\xconnect root\App_Data\jobs\continuous\IndexWorker\App_Data\Models

ContactFacetExtModel, 0.1.json

   {
  "Name": "ContactFacetExtModel",
  "Version": "0.1",
  "References": [
    {
      "Name": "XConnect",
      "Version": "1.0"
    },
    {
      "Name": "Sitecore.XConnect.Collection.Model",
      "Version": "9.0"
    }
  ],
  "Types": {
    "CustomFacets.ContactFacetExtension": {
      "Type": "Facet",
      "BaseType": "Sitecore.XConnect.Facet",
      "ClrType": "CustomFacets.ContactFacetExtension, CustomFacets, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null",
      "Properties": {
        "Subscribe": {
          "Type": "String"
        },
        "Unsubscribe": {
          "Type": "String"
        },
        "Property": {
          "Type": "String"
        }
      }
    }
  },
  "Facets": [
    {
      "Target": "Contact",
      "Name": "ContactExt",
      "Type": "CustomFacets.ContactFacetExtension"
    }
  ]
}

Patches made:

   <settings>
      <setting name="ListManagement.Import.FacetsToMap">
        <patch:attribute name="value">Emails|Personal|Addresses|ContactExt</patch:attribute>
      </setting>
    </settings>

    <xconnect>
      <runtime type="Sitecore.XConnect.Client.Configuration.RuntimeModelConfiguration,Sitecore.XConnect.Client.Configuration">
        <schemas hint="list:AddModelConfiguration">
              <schema name="contactfacetextmodel" type="Sitecore.XConnect.Client.Configuration.StaticModelConfiguration,Sitecore.XConnect.Client.Configuration" patch:after="schema[@name='collectionmodel']">
                  <param desc="modeltype">CustomFacets.ContactFacetExtModel, CustomFacets</param>
              </schema>
        </schemas>
      </runtime>
    </xconnect> 

Is my json.config file not being read? What's the best way to debug this? Not seeing anything relevant in the logs.