gamefans The sticky post under the label will not display the summary, and the sticky post in the label will not be displayed under all themes.
Okay, there's 3 different behaviors here you're seeing all related to how Flarum treats stickies.
The excerpt will appear for unread Sticky first posts.
The unread Sticky will stick on the top of all discussions, and will always stick on the top of the discussion listings for tags it belongs to.
All threads are considered unread when you log out because you are now a guest.
Ergo, as a guest you see the excerpt and the sticky is on top of All Discussions. When you are logged in, and the sticky discussion has been read, you see what you described in the quoted text.
Anonymous43 No, having two classes as distinct selectors will apply the CSS property to both. Note to > symbol in between the selectors in my first post, that denotes a parent > child relationship. I just did that to ensure only the discussion list excerpt is targeted, since I believe the same class name is used elsewhere in Flarum.