runtime: KeyValuePair is not properly serialized with JsonNamingPolicy.CamelCase - System.Text.Json

When serializing a collection of KeyValuePair with CamelCase enabled the properties are serialized in PascalCase:

MVC Configuration is:

.AddJsonOptions(options =>
{
    options.JsonSerializerOptions.DictionaryKeyPolicy = JsonNamingPolicy.CamelCase;
    options.JsonSerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.CamelCase;
}

The result is:

{ Key: "Test", Value: "Test1" }

Expected result:

{ key: "Test", value: "Test1" }