@Model changes for @Transient property not propagating to view

I have a question regarding the following SwiftUI setup using @Model.

I have a parent view which queries the model, extracts the first element, and passes that to child views.

My issue is that when I make changes to properties marked as @Transient in the model, the child views do not re-render.

Parent

struct ParentView: View {
    @Query private var myData: [MyData]
    
    var body: some View {
        if let data = myData.first {
            TabView {
                Overview(data: data)
                Details(data: data)
            }
            .tabViewStyle(.verticalPage(transitionStyle: .identity))
        } else {
            ContentUnavailableView {
                Label {
                    Text(verbatim: "Failed to load app content")
                } icon: {
                    Image(systemName: "xmark")
                }
            }
        }
    }
}

Child

struct ChildView: View {
    var data: WaterData
    
    var body: some View {
        Text("\(data.progress)")
    }
}

If I query the model in the child view directly, then changes correctly propagate to the child view.

What am I doing wrong? Is there a property with which I can mark the var data in the child view to let SwiftUI know it should observe changes?

The underlying data in the model is marked @Transient because the source of truth is synched from Apple Health:

@Transient public var samples: [HKQuantitySample] = []

I should also note that the child view renders based on computed properties, such as:

public var progress: Double {
    let todaysRecords = samples.filter {
        Calendar.autoupdatingCurrent.isDateInToday($0.endDate)
    }
    let sum = todaysRecords.reduce(0, { sum, record in
        sum + record.quantity.doubleValue(for: .literUnit(with: .milli))
    })
    return sum
}

Apologies for the messy post. I'm not sure which part of this setup breaks the UI updates. I could imagine having a transient property and using computed vars in the UI prevent SwiftUI from knowing about the changes. On the other hand, if I do the @Query inside the child view, it works, despite the transient prop and computer vars.