Unable decoding GeoPoint

[MartijnSchoemaker]

I already found the other issue about this problem, but it's still not fixed for me. Probably I'm doing something very wrong, but I cannot find it.

At first I also used FirebaseDecoder, but switching to FirestoreDecoder doesnt solve the issue. The issue is this error:
Swift.DecodingError.typeMismatch(Swift.Dictionary<Swift.String, Any>, Swift.DecodingError.Context(codingPath: [CodingKeys(stringValue: "location", intValue: nil)], debugDescription: "Not a dictionary", underlyingError: nil))

Code looks like this:

struct Restaurant: Decodable {
    var address: String
    var city: String
    var name: String
    var location: GeoPoint
}

extension GeoPoint: GeoPointType {}
let restaurant = try! FirestoreDecoder().decode(Restaurant.self, from: snapshot.data()!)

snapshot.data():

(lldb) po snapshot.data()
▿ Optional<Dictionary<String, Any>>
  ▿ some : 4 elements
    ▿ 0 : 2 elements
      - key : "location"
      - value : <FIRGeoPoint: (52.097472, 5.115436)>
    ▿ 1 : 2 elements
      - key : "address"
      - value : asdf
    ▿ 2 : 2 elements
      - key : "city"
      - value : asdfd
    ▿ 3 : 2 elements
      - key : "name"
      - value : asdf