Cannot import Package that has FirebaseAnalytics as dependency

I have a main project with some local packages. These packages are imported in the main project as features. I want to have an Analytics package that is a simple wrapper around Firebase Analytics that can be imported in some of those packages. The main target also has the Firebase Analytics package for legacy reasons.

I can import the package in my main project.

Somehow, I can build the project, but it fails to build for testing when the Analytics package is imported in other packages. Its giving errors like: Undefined symbol: _GULIsLoggableLevel.

I've tried to set the linkerFlag -ObjC on the package already, doesn't make a difference. What's going wrong? Do I need to change something in my test target of the main project?

This is my Package.swift:

// 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: "Analytics",
    platforms: [.iOS(.v16), .macCatalyst(.v15)],
    products: [
        .library(
            name: "Analytics",
            targets: ["Analytics"])
    ],
    dependencies: [
        // Dependencies declare other packages that this package depends on.
        .package(url: "https://github.com/firebase/firebase-ios-sdk.git", from: "11.12.0")
    ],
    targets: [
        .target(
            name: "Analytics",
            dependencies: [
                .product(name: "FirebaseAnalytics", package: "firebase-ios-sdk")
            ]),
        .testTarget(
            name: "AnalyticsTests",
            dependencies: ["Analytics"])
    ]
)