Abstract properties are generated in abstract classes.

[costleya]

The .NET generator will generate jsii properties marked abstract as concrete properties with implementations. This does not break anything - superclasses will override these properties with the same body. However, it is unnecessary.

Example:

"jsii-calc.AbstractClassBase": {
      "abstract": true,
      "assembly": "jsii-calc",
      "fqn": "jsii-calc.AbstractClassBase",
      "initializer": {
        "initializer": true
      },
      "kind": "class",
      "name": "AbstractClassBase",
      "properties": [
        {
          "abstract": true,
          "immutable": true,
          "name": "abstractProperty",
          "type": {
            "primitive": "string"
          }
        }
      ]
    },

Generates:

[JsiiClass(typeof(AbstractClassBase), "jsii-calc.AbstractClassBase", "[]")]
public abstract class AbstractClassBase : DeputyBase
{
    protected AbstractClassBase(): base(new DeputyProps(new object[]{}))
    {
    }

    protected AbstractClassBase(ByRefValue reference): base(reference)
    {
    }

    protected AbstractClassBase(DeputyProps props): base(props)
    {
    }

    [JsiiProperty("abstractProperty", "{\"primitive\":\"string\"}")]
    public virtual string AbstractProperty
    {
       get => GetInstanceProperty<string>();
    }
 }