Using @Environment will crash in Preview

[zhuscat]

Description

Here is my code:

import SwiftUI
import Perception

@Perceptible
class HelloModel {
  var msg: String = "Hello, World"
}

struct HelloView: View {
  @Environment(HelloModel.self) var model

    var body: some View {
      WithPerceptionTracking {
        Text(model.msg)
      }
    }
}

#Preview {
    HelloView()
      .environment(HelloModel())
}

It crashes in preview:

== PAUSED REASON:

    processCrashed



== PREVIEW UPDATE ERROR:

    CrashReportError: Fatal Error in Environment.swift
    
    fito crashed due to fatalError in Environment.swift at line 54.
    
    No perceptible object of type HelloModel found. A View.environment(_:) for HelloModel may be missing as an ancestor of this view.

Checklist

• I have determined that this bug is not reproducible using Swift's observation tools. If the bug is reproducible using the @Observable macro or another tool from the Observation framework, please file it directly with Apple.
• If possible, I've reproduced the issue using the main branch of this package.
• This issue hasn't been addressed in an existing GitHub issue or discussion.

Expected behavior

No crash happened

Actual behavior

Crash happened

Steps to reproduce

Described in description

Perception version information

1.4.1

Destination operating system

iOS 16.0

Xcode version information

Version 16.1 (16B40)

Swift Compiler version information

No response

[zhuscat]

Using PreviewProvider is working:

struct HelloView_Previews: PreviewProvider {
    static var previews: some View {
      HelloView()
        .environment(HelloModel())
    }
}

[mbrandonw]

Hi @zhuscat, since this works with preview provides I'm inclined to consider this an Apple bug. If someone finds a work around we will happily accept a PR, but this isn't something we personally have time to investigate.

Since this isn't an issue with the library I am going to convert it to a discussion. Please feel free to continue the conversation over there!