ios – What is the most dependable / safest way to make sure the model updates after deleting an item in SwiftData / CloudKit?

I have a situation in SwiftData / CloudKit where I’m deleting a model object ParentA that has the following property:

@Relationship(deleteRule: .cascade, inverse: \Child.parentA) var children: [Child]?

After ParentA gets deleted, so will its children property and all the Child objects within. However, Child is also owned by a different model object ParentB, such that after ParentA gets deleted, I need to check and see if any ParentBs exist that have an empty Child array and delete them if so.

The problem is the SwiftData model doesn’t update immediately after I delete parentA, so that if I try to check which parentB.children are empty, the change will not have occurred (even with autosave turned on):

static func removeEmptyParentBs(in parentA: ParentA, from queriedChildren: [Child], modelContext: ModelContext)
{
    if let children = parentA.children
    {
        for child in children.filter({ queriedChildren.contains($0) })
        {
            if let parentBChildren = child.parentB?.children
            {
                if (parentBChildren.isEmpty)
                {
                    //delete parentB
                }
            }
        }
    }
}

To get the change to register, I have to put try? modelContext.save() or modelContext.processPendingChanges() at the top of removeEmptyParentBs. I’m wondering if there is a better way to go about syncing the results without having to force it to save or if not, which of those two is the best?