Restricting eloquent result with scope on relation not filtering results

We have 3 tables transaction, transactionItem and transactionItemStatus all setup with relationships in their respective models, yet when trying to filter transactions by the status of their items the results are unchanged.

Definition of the relationships in the models:

In Transaction.php

public function items()
{
    return $this->hasMany('App\Entities\Transaction\TransactionItem\TransactionItem', 'transactionId', 'transactionId');
}

In TransactionItem.php

public function currentStatus()
{
    return $this->belongsTo('App\Entities\Transaction\TransactionItem\StatusDefinition', 'currentStatusId', 'statusId');
}

The scope in Transaction.php used to restrict based on the relationship

public function scopeOfTypeDraft($query)
{
    $query->whereHas('items.currentStatus', function ($query) {
        $query->where('label', '=', 'Draft');
    });
}

The use of the scope in a controller

return Transaction::with([
    'items',
    'items.toTaxYear',
    'items.counterpartyId',
    'items.currentStatus',
])
->ofTypeDraft()
->get()

As you can see, Transaction is setup with a hasMany relationship with TransactionItem, TransactionItem is setup with a belongsTo relationship with Status. However when we try to restrict the results of an Eloquent query of Transaction by using a scope (or just a simple ->whereHas() with a ->where()) then the results aren't changed compared to omitting the scope. However if we perform a simple the where() on the collection that is returned, then the results are correctly filtered.

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