Build settings from PackageSettings not work as expected

[mo5tone]

What happened?

I want to add some build setting for my local swift package through PackageSettings.

But I found baseSettings and targetSettings cannot work as expected. Check below Package.swift.

Some build settings are missing in generated project and some are overwritten.

Tuist/Package.swift

// swift-tools-version: 5.9
import PackageDescription

#if TUIST
    import ProjectDescription

    let packageSettings = PackageSettings(
        baseSettings: .settings(
            base: [
                "SWIFT_ACTIVE_COMPILATION_CONDITIONS": [
                    "$(inherited)",
                    "BASE_SETTINGS_A", // ❌ missing
                ],
                "OTHER_SWIFT_FLAGS": [
                    "$(inherited)",
                    "-D",
                    "BASE_SETTINGS_B", // ❌ missing
                ],
                "FOO": "FOO", // ✅ works as expected
            ]
        ),
        targetSettings: [
            "LocalPackageTarget": [
                "SWIFT_ACTIVE_COMPILATION_CONDITIONS": [
                    "$(inherited)",
                    "TARGET_SETTINGS_A", // 🤔 works, but SWIFT_PACKAGE is missing, have to add back manually
                ],
                "OTHER_SWIFT_FLAGS": [
                    "$(inherited)",
                    "-D",
                    "TARGET_SETTINGS_B", // ✅ works as expected
                ],
                "BAR": "BAR", // ✅ works as expected
            ],
        ]
    )
#endif

let package = Package(
    name: "Demo",
    dependencies: [
        .package(url: "https://github.com/Alamofire/Alamofire", from: "5.9.1"),
        .package(path: "LocalPackagePath"),
    ]
)

How do we reproduce it?

1. mkdir tuist_issue_project && cd tuist_issue_project
2. tuist init
3. edit Tuist/Package.swift to the above code
4. tuist install && tuist generate
5. check the build settings from generated project

Error log

No error messages, just unexpected behaviors.

macOS version

13.6.6

Tuist version

4.11.0

Xcode version

15.2