Describe the bug 🐞

I ran into this error:

The JSON payload for polymorphic interface or abstract type 'CleanAspCore.Api.Endpoints.Weapons.CreateWeaponRequest' must specify a type discriminator. Path: $ | LineNumber: 0 | BytePositionInLine: 10

It seems refit is not taking into account JsonDerivedType. I assume because its not using the base type that contains those attributes.

Step to reproduce

1. Use json serialization with derived classes: https://learn.microsoft.com/en-us/dotnet/standard/serialization/system-text-json/polymorphism
2. Send a request
3. Notice the type discriminator property is missing which causes problems when deserializing

Reproduction repository

https://github.com/reactiveui/refit

Expected behavior

The type disriminator is included in the json payload

Screenshots 🖼️

No response

IDE

Rider

Operating system

Windows

Version

11

Device

PC

Refit Version

8.0.0

Additional information ℹ️

No response