Hi, I’m investigating the issue yet. There is something that catches my attention, the preview does not work, for example I add a cover page or text, the automatic save fucniona correctly, but when you click on preview the changes simply do not show them. Only when updating generates the changes. I am working with wordpress 5.0.3, GP Pemium, GeneratePress Child and localhost mode. This is normal ?.
Update:
The bug in Gutenberg that stopped the Preview from working correctly has now been resolved in the latest Gutenberg Plugin version 5.5 – the fix will be rolled out in WordPress 5.2 around the beginning of May.
My tests with the latest editor show that the Preview will refresh if:
a. A Published post is updated.
b. The save as draft is clicked.
c. The preview is clicked.