1. Content > Documents and Media
2. Add a new basic document add an image and save it
3. Check if the image thumbnail is there, if not, try to refresh the page.
thumbnail is shown when user refresh documents and media
When the user publish the document, user is able to view the thumbnail without refreshing the page
Reproduced on: Tomcat 9.0.6 + MySQL 5.7.
Portal master GIT ID:9aad02cb1d69eeb74ac725a62b78e068e3005ba8
View file attached.