Need your advice on how to resolve this error message “ERR_HTTP_RESPONSE_CODE_FAILURE” in javascript using playwright.

Lately, we have come across an issue in our application, where two users filled in the form details and clicked submit to find summary with information swapped. I am looking to simulate the scenario where two PlayWriht tests run parallel but the last step/action execute at once.

I have a page that I`m navigating on playwright and then i have to click on a element to open a popup to get a preview of the pdf file