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 ?.
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.