yea that looks like expected behavior unfortunately. the pinned button and topic notifications buttons are outside the topic-footer-main-buttons div. not sure if it’s possible but those two buttons should at the very least be in their own row together, but it would definitely be more ideal if they could render inside the topic footer main buttons row here.
edit: Moin pointed out to me that this is because Horizon hides the text explainers (that i don’t usually pay attention to lol)
they can be displayed by using this CSS if one needs:
.notifications-button-footer .reason .text,
.pinned-button .reason .text {
display: inline-flex;
}