Tomcat 9.0.17 + MySQL 5.7. Portal master GIT ID: 5ceae73cc9a47f9dbad12935eedb68e9f0f166b4.
Steps to reproduce:
- Add a content page
- Add a section fragment
- Click on the fragment (this brings up the "Select Background" button)
- Click away from the fragment (can also click "Publish" or navigate somewhere else)
"Select background" button goes away.
"Select background" button stays and is usable to a certain point but will break after user uploads a file. The only way to get rid of it is either to click the fragment to make it disappear or to refresh the page.