Problem with form-ajax-submit-onchange (v8)

I have this form:

<form action="#" method="POST" class="form-ajax-submit-onchange">
	<input type="text" name="test" value="" placeholder="test" />

But it POSTS only [object Object].

How can I fix this?
I’m using F7v8.3.0.

I fixed my problem by modifying the core framework7-bundle.js file. However, I don’t want to have to make this change every time there’s a Framework7 update. Is there a better way to retrieve the field values?

This is my modification:

framework7-bundle.js, code line 20175

if (method === 'POST') {
  if (contentType === 'application/x-www-form-urlencoded' || contentType === 'application/json') {
    //data = app.form.convertToData($formEl[0]);
    data = serializeObject(app.form.convertToData($formEl[0])); // CHANGED BY FLORIS ON 2-10-2023 TO POST FORMFIELDS
    if (contentType === 'application/json') {
      data = JSON.stringify(data);
  } else {
    data = new window.FormData($formEl[0]);