Issue payment page (not complete) back to thank you page

Hi,

I’ve problem with flow checkout on my store when i’m on payment list page (Midtrans Vendor).

In payment list page with condition i dont select payment method anything and then i click back arrow from browser, then the page will direct to thank you page even though my order not complete and not select anything on payment list page. I think the page should be direct to checkout page again.

I attached video how to i produce the issue

Thank youu