Form page redirect error after update to 1.4.5/form/login/admin

Support
1

After submiting the form it gives “400 - Display page not found. Please check the page exists.”
The form page have a subpage named Thankyou with formdata.md that was working before the update.

I’m working on a duplicate version of Quark and this theme did have an update along with the rest of the plugins and Grav itself. Could it be it?

Thank you in advance.
Pedro

2

For some reason its working again…
The only thing I did was remove cache from homepage (not modular) where one of the forms was…

Is there a way, after form submission, to redirect to the same page and show the alert message in there?

Cheers!
Pedro