When the top bar stickiness is enabled or disabled, in the answer section while edit an answer If I select any one of the previous revision, I'm receiving the warning below in the side bar:
You're editing an old revision. If you save it, you will effectively roll back to this old version of the post.
While the warning is displayed, If I scroll the page the warning block is fully hide by the top bar, when I view the page on a small screen or reduce the window height if having a standard screen.
Already I have raised a similar issue for the question section and it was fixed, it is occurring only for the answer section.
Sample edit to reproduce the issue in the answer section.
GIF for the same:
OS : Windows 10 Pro
Google Chrome: Version 71.0.3578.98 (Official Build) (64-bit)
Mozilla Firefox: 65.0 (64-bit)