type_contents_order false positive when using custom availability macro in Swift Package

[jarrodrobins]

New Issue Checklist

• I've Updated SwiftLint to the latest version.
• I've searched for existing GitHub issues.

Bug Description

I have noticed that I am receiving a false positive for type_contents_order when using a custom availability macro in a Swift Package. When I don't use the custom availability macro and just use Apple's built in ones, SwiftLint does not throw a false positive at all.

Here is my Package.swift file defining the availability macro -

// swift-tools-version: 6.0
// The swift-tools-version declares the minimum version of Swift required to build this package.

import PackageDescription

let package = Package(
    name: "SwiftLintRegression",
    platforms: [.iOS(.v15)],
    products: [
        .library(
            name: "SwiftLintRegression",
            targets: ["SwiftLintRegression"]),
    ],
    dependencies: [
        .package(url: "https://github.com/SimplyDanny/SwiftLintPlugins", exact: "0.58.2")
    ],
    targets: [
        .target(
            name: "SwiftLintRegression",
            swiftSettings: [
                .enableExperimentalFeature(
                    "AvailabilityMacro=SwiftUI_v5:iOS 17.0, macOS 14.0, tvOS 17.0, watchOS 10.0, visionOS 1.0" // https://github.com/swiftlang/swift/pull/65218
                )
            ],
            plugins: [.plugin(name: "SwiftLintBuildToolPlugin", package: "SwiftLintPlugins")]
        ),

    ]
)

And here is my sample view which throws the error -

import SwiftUI

struct ContentView: View {
    // type_contents_order violation thrown here
    @available(SwiftUI_v5, *)
    var v5Body: some View {
        EmptyView()
    }

    var body: some View {
        EmptyView()
    }
}

Swapping around the vars does not solve the issue.

If I replace it with the following, the error isn't thrown.

struct ContentView: View {
    @available(iOS 17.0, macOS 14.0, tvOS 17.0, watchOS 10.0, visionOS 1.0, *)
    var v5Body: some View {
        EmptyView()
    }

    var body: some View {
        EmptyView()
    }
}

Environment

• SwiftLint version: 0.58.2
• Xcode version: 16.2
• Installation method used: I have tested both Swift Package Manager and Mint
• Configuration file:

opt_in_rules:
  - type_contents_order

Are you using nested configurations? If so, paste their
relative paths and respective contents.
N/A