I have some draft pages that are being worked on, they have already been made but when previewing them – the text appears for a brief moment and then disappears.
This is happening on 4/5 most recent pages we have made but we are not sure as to why.
Please deactivate all the 3rd party plugins and activate only theme-required plugins on the site and then check the issue. I am sure your issue will be solved. Then Activate the 3rd party plugins one by one and check which plugin is creating the issue for you.
Otherwise, if the issue still exists then keep the 3rd party plugins deactivated and share the wp logins details so I will check and give you a possible solution.