Sticky header for table not working

Summary

In the new Confluence release, as mentioned here, the table headers in Confluence Cloud is supposed to stick to the top when large tables are scrolled.

Steps to reproduce:

1. Create blank page
2. Create a large table, with header
3. Save the page

Observed Behaviour
Try to scroll and header will not be sticky on the top

Expected Behaviour
The table header will stick when we scroll the page.