Captcha validation it's not working appropriately when raise request to a login free portal

Issue Summary

Sometimes Captcha it's not working appropriately when you enable the Login-free portal. While trying to submit a request the users receive the following error message on UI:

We couldn't verify that you're not a robot. Try sending the request again.

But Jira Service Management does not even provide the users the ability to verify at all.

This is reproducible on Data Center: (yes) / (no)

Steps to Reproduce

1. Go to Products > Customer Access
2. Enable Allow customers to create accounts and Customers can access and send requests from the portal without logging in
3. Go to any JSM project , open the project to public.
4. Raise request from portal as anonymous and insert the "Email Confirmation to" field

Expected Results

Able to raise request

Actual Results

Got the error below :-

We couldn't verify that you're not a robot. Try sending the request again.

Workaround

Reach out to support to apply the workaround.