@EnvironmentObject conforming to protocol: Xcode not compiling

I'm playing with SwiftUI and would like to abstract an @EnvironmentObject. The goal is to switch from a production BindableObject to a fake one (testing / working local ...)

First I just declared a protocol:

protocol FetcherInterface: BindableObject {
    associatedtype T
    var didChange: PassthroughSubject<[T], Never> { get set }
    var values: [T] { get set }
}

Then I can wrote a network root class conforming to FetcherInterface:

open class NetworkFetcher<T: Decodable>: FetcherInterface {

    public var didChange = PassthroughSubject<[T], Never>()
    internal var values: [T] = [T]() {
        didSet {
            DispatchQueue.main.async {
                dump("did set network values \(self.values)")
                self.didChange.send(self.values)
            }
        }
    }

    internal func loadAsync(values: [T]) {
        DispatchQueue.global().asyncAfter(deadline: .now() + 1) {
            self.values = values
        }
    }
}

I can now have a child class like this one:

final class PlacesNetworkFetcher: NetworkFetcher<Place>, PlacesQueryInterface {

    func loadPlacesFromCountryCode(_ countryCode: String) {
        self.loadAsync(values: [Place(id: UUID(), name: "London")])
    }
}

with PlacesQueryInterface:

protocol PlacesQueryInterface {
    func loadPlacesFromCountryCode(_ countryCode: String)
}
extension PlacesQueryInterface where Self: FetcherInterface {}

When I want to use all of this in my ContentView.swift Xcode never end compilation. Looks like environment object is causing this:

@EnvironmentObject var placesQueryInterface: PlacesQueryInterface

Do you have an idea why ?

edit: I put a project skeleton if you want to test