Interface desarialization doesn't work

I have the following schema:

union ValidationRule = MinimumCharacterRule

type MinimumCharacterRule {
    value: Int!
}

It will generate the following classes:

@JsonTypeInfo(
    use = JsonTypeInfo.Id.NAME,
    include = JsonTypeInfo.As.PROPERTY,
    property = "__typename"
)
@JsonSubTypes(@JsonSubTypes.Type(value = MinimumCharacterRule.class, name = "MinimumCharacterRule"))
public interface ValidationRule {
}

@JsonTypeInfo(
    use = JsonTypeInfo.Id.NONE
)
public class MinimumCharacterRule implements ValidationRule {
...
}

If I try to deserialize the MinimumCharacterRule class I will get the following error:

Could not resolve subtype of [simple type, class com.example.ValidationRule ]: missing type id property '__typename'

The issue provides the schema and generated ValidationRule and MinimumCharacterRule classes but names no repository file or test. Start by reproducing deserialization of MinimumCharacterRule and inspect how the generated Jackson annotations handle __typename; done means the generated types deserialize without the reported missing type-id error, with regression coverage if the relevant test area is found.