GiveWP New Form Builder – Invalid Form ID, Form not found

I’ve recently updated the GiveWP plugin to its latest version and created a new form using a new builder. While the design looks impeccable, it unfortunately isn’t functioning properly. Upon testing it on a fresh WordPress installation, I consistently encounter the error message “Invalid Form ID, Form not found.” I’ve attempted to troubleshoot by testing it with various gateways—both offline and my custom gateway—but to no avail. Interestingly, the legacy form still works without any issues.

Digging deeper, when I inspect the JSON response, I receive the following:

{
   "success":false,
   "data":{
      "type":"validation_error",
      "errors":{
         "errors":{
            "formId":["Invalid Form ID, Form not found"]
         },
         "error_data":[]
      }
   }
}

Despite scouring through forums and threads, I haven’t found a satisfactory solution to this problem. It doesn’t seem to be related to PayPal or any specific gateway. I’ve even attempted to address it by altering the PHP version and rolling back GiveWP to a previous version, yet none of these efforts have proven fruitful. Does anyone happen to have a solution for this perplexing issue?