"Confirm completion drupal ajax form ajaxsubmit is not a function" error on confirming verify challenge button in academy exercise

On completion of challenges of a mission and click of Mark as Complete button a dialog box appears with an error message. On click of Ok of the dialog box and again clicking Mark as Complete the error keeps on coming and not able to submit an exercise at any time.
Occurs in different browsers and in different sessions.
Attached screenshot of the error displayed on click of button in challenge screen of Pega academy.
Recurring for many times and last time contacted Pega academy support but no response was provided and no reply mail was sent. So was not able to contact the person who responded to the request. Kept on getting only no reply mails.

@NivedhaK Hi Nivedha,

Could you provide the details of a specific challenge so we can investigate?

@eddie.jm I had attempted the AI for 1:1 Customer Engagement and Cross Sell on the web for which these challenges had this error. And When I decided to attempt the module and wait for challenges they were automatically updated once the test was done.
I faced this in part of Low Code App Builder where I lost my progress after partial completion and errors on click of completion.
But still I want to do those challenges without the errors.