We already noticed that HubSpot gives an error if you edit the form target that HubSpot inject using the embed code. We used for open the form response in a new blank page but now does not works. You have to use the default form target.
For a form without a redirect URL, that’s the expected behavior. The response sent on submission is a 204, so setting the target attribute to “_blank” just ‘opens’ that 204 in a new tab. If you set a redirect URL, then it should open up that URL in a new tab. It’s possible that some browsers (particularly Chrome) might block this as a popup, however, and there’s no way to prevent that, so use that technique at your own risk.
Are you referring to the target parameter included when customizing the form embed code (see below)? Or are you referring to the target that the form information is submitted to?