When the user was trying to open a sc_request record (REQ) in self-service view, the page would open as a standard white HTML page with just the text error below:
The element type "table" must be terminated by the matching end-tag "</table>"
This is a newly discovered problem, <a href="https://support.servicenow.com/problem.do?sys_id=a9687819db9bb490770be6be139619fa&sysparm_view=case"><span style="color:#00F">PRB1533260</span></a>.
The current workaround to this, as the issue happens when the Request is in "self-service" view (as per the problem details), is to go to the list-view for requests (sc_request_list.do) and set the view in the top left hamburger icon to "Default". Then, on opening the Request, the form will render properly.