Is Freeform duplicating the attributes on my form?

[jaspertandy]

What happened?

I have a multi-step form which I have attached some custom attributes to. The form tag looks like this:

<form columnclass="form__field" class="form" errorclass="form__error" method="post" novalidate="" data-freeform="" data-id="0f6ea3-form-6257yJYng-N24xwMVda-OvrIwCjGveiqdrh3dhlUMJdVkg89u9Wcx9iOWlSB" data-handle="trainingWorkshop3" data-disable-submit="" data-show-processing-spinner="" data-auto-scroll="" data-show-processing-text="" data-processing-text="Processing..." data-success-message="Form has been submitted successfully!" data-error-message="Sorry, there was an error submitting the form. Please try again." data-scroll-to-anchor="" data-payment-target="form form" data-attendees-selector="form-input-attendees form-input-attendees" data-freeform-flexbox="">

As you may be able to see here, my attributes have duplicated values in them:

data-payment-target="form form" data-attendees-selector="form-input-attendees form-input-attendees"

My config for this form looks like this:

It's almost like every time I submit a step of my form, it stacks another value into these attributes.

Errors and Stack Trace (if available)

How can we reproduce this?

1. Create a multi-step form in Freeform
2. attach some attributes to the form in settings
3. observe as you move through each step, your attribute value will be duplicated

Freeform Edition

Pro

Freeform Version

5.9.3

Craft Version

5.6.3

When did this issue start?

No response

Previous Freeform Version

No response