Unable to Use RequestStacks for Adding Content to Line-Item Payload after Shopware 6.5.4.0

Question

How do I add content into a line item after Shopware 6.5.4.0 without RequestStacks?

Since the update to Shopware 6.5.4.0, it seems that using RequestStacks to add content to the payload of a line item doesn't work anymore.

Previously, I utilized the following code snippet:

<label class="form-label" for="product-instruction-{{ product.id }}"></label>
 <input type="text"
        placeholder="Additional instruction"
        id="product-instruction-{{ product.id }}"
        name="lineItems[{{ product.id }}][payload][instruction]"
        class="form-control"
                            />

However, after 6.5.4.0, the line: name="lineItems[{{ product.id }}][payload][instruction]"

is giving the Error:

mb_strlen(): Argument #1 ($string) must be of type string, Shopware\Core\Framework\Validation\DataBag\RequestDataBag given

Is there an alternative method or workaround to achieve the same outcome?