Start Scene Builder
Drop an AnchorPane, and a Button.
From the inspector, set the Button textFill to any color.
Open the CSS Analyzer.
From its menu button (on top right), select "Hide Properties with Default Values" : only the text-fill property is shown.
Show again all the properties: select "Show Properties with Default Values".
Try to move down the scrollbar: it is very quickly moving to the end of the content, then has no effect.
==> the scollbar is unsynchronized from the content.

Other way to get the issue:
add anchor pane
show analyzer
add label
try to scroll