Trouble with new XCode 15 Preview Macro for Widgets

I'm trying to get rid of the auto-padding added recently by iOS 17, and I found out that you can use the WidgetConfigurations properly with the new Preview Macro, but I'm having trouble getting it to work, and some help would be much appreciated.

Here's my code:

struct ChartEntry: TimelineEntry {
    let date: Date
    let configuration: ConfigurationIntent
    ...

    static func getSampleEntry() -> ChartEntry {
        let sample = ChartEntry(date: Date(), configuration: WidgetUtils.getSampleConfiguration())
        return sample
    }
}

struct PreviewTimelineProvider: TimelineProvider {
    
    typealias Entry = ChartEntry

    func placeholder(in context: Context) -> ChartEntry {
        ChartEntry.getSampleEntry()
    }

    func getSnapshot(in context: Context, completion: @escaping (ChartEntry) -> Void) {
        completion(ChartEntry.getSampleEntry())
    }

    func getTimeline(in context: Context, completion: @escaping (Timeline<ChartEntry>) -> Void) {
        var entries: [ChartEntry] = []

        let currentDate = Date()
        for hourOffset in 0 ..< 5 {
            let entryDate = Calendar.current.date(byAdding: .hour, value: hourOffset, to: currentDate)!
            let entry = ChartEntry(date: entryDate, configuration: WidgetUtils.getSampleConfiguration())
            entries.append(entry)
        }

        let timeline = Timeline(entries: entries, policy: .atEnd)
        completion(timeline)
    }
}

struct DailyHoursOfSunshine: Identifiable {
    let id = UUID()
    var date: Date
    var hoursOfSunshine: Double

    init(date: Date, hoursOfSunshine: Double) {
        self.date = date
        self.hoursOfSunshine = hoursOfSunshine
    }
}

var data = [
    DailyHoursOfSunshine(date: Date(), hoursOfSunshine: 0), // Sunday
    DailyHoursOfSunshine(date: Date().addingTimeInterval(86400), hoursOfSunshine: 60), // Monday
    DailyHoursOfSunshine(date: Date().addingTimeInterval(2 * 86400), hoursOfSunshine: 50), // Tuesday
    DailyHoursOfSunshine(date: Date().addingTimeInterval(3 * 86400), hoursOfSunshine: 72), // Wednesday
    DailyHoursOfSunshine(date: Date().addingTimeInterval(4 * 86400), hoursOfSunshine: 88), // Thursday
    DailyHoursOfSunshine(date: Date().addingTimeInterval(5 * 86400), hoursOfSunshine: 70), // Friday
    DailyHoursOfSunshine(date: Date().addingTimeInterval(6 * 86400), hoursOfSunshine: 120) // Saturday
]

struct ChartSmallView: View {
    var entry: ChartEntry

    var body: some View {
        VStack {
            Spacer()

            VStack(alignment: .leading, spacing: 0) {
                Chart(data) {
                    AreaMark(
                        x: .value("Week", $0.date),
                        y: .value("Hours of Sunshine", $0.hoursOfSunshine)
                    )
                    .alignsMarkStylesWithPlotArea()
                }
                .foregroundStyle(
                    .linearGradient (
                        colors: [.blue, .clear],
                        startPoint: .top,
                        endPoint: .bottom
                    )
                )
                .chartXAxis(.hidden)
                .chartYAxis(.hidden)
                .chartLegend(.hidden)
                .padding([.horizontal], 3)
            }

            Spacer()
        }
        .frame(maxWidth: .infinity)

    }
}

#Preview("Small", as: .systemSmall) {
    ChartWidget()
} timelineProvider: {
    PreviewTimelineProvider()
}

NOTE: There's nothing much on my ChartWidget struct, just the configuration to disable the margins and declare the preferred size and calling the ChartSmallView struct, I just didn't copy it here because it is in another file and I'm a little busy to go out excluding sensible information. I would actually prefer to call just ChartSmallView on my preview, but then I wouldn't have access to the configuration that disables the awful contextualized margins.

The code compiles just fine, but when the preview tries to build it, the following error happens:

== PREVIEW UPDATE ERROR:

CompileDylibError: Failed to build ChartSmallView.swift

Compiling failed: cannot convert value of type 'PreviewTimelineProvider' to closure result type 'any View'

@__swiftmacro_63MyWidgetExtension_PreviewReplacement_ChartSmallView_133_77BD2C8074131F1FDF53BC08606762A7Ll0F0fMf_.swift
------------------------------
@available(iOS 17.0, macOS 14.0, tvOS 17.0, watchOS 10.0, xrOS 1.0, *)
struct $s63MyWidgetExtension_PreviewReplacement_ChartSmallView_133_77BD2C8074131F1FDF53BC08606762A7Ll0F0fMf_15PreviewRegistryfMu_: DeveloperToolsSupport.PreviewRegistry {
    static let fileID: String = "MyWidgetExtension_PreviewReplacement_ChartSmallView_1/ChartSmallView.1.preview-thunk.swift"
    static let line: Int = 125
    static let column: Int = 1

    static func makePreview() throws -> DeveloperToolsSupport.Preview {
        DeveloperToolsSupport.Preview("Small", as: .systemSmall) {
            ChartWidget()
        } timelineProvider: {
            PreviewTimelineProvider()
        }
    }
}
------------------------------
/.../MyWidgetExtension.build/Objects-normal/x86_64/ChartSmallView.1.preview-thunk.swift:137:13: error: cannot convert value of type 'PreviewTimelineProvider' to closure result type 'any View'
            PreviewTimelineProvider()
            ^~~~~~~~~~~~~~~~~~~~~~~~~
                                      as! any View

I have also attempted to use the Preview Macro in the following way:

#Preview("Small", as: .systemSmall) {
    ChartWidget()
} timeline: {
    ChartEntry.getSampleEntry()
}

But achieved the same result.

If anyone has any idea of what I'm doing wrong, I would appreciate the help. I couldn't find much material online to help me here