When dragging the timeline handle to the end, you jump to the bottom of the page. If your viewport is short, this means you may skip past the last post entirely and land on suggested topics or a footer.
When dragged to the end you should probably end up at the bottom of the last post… the jump to the bottom of the page is especially annoying in PMs that have both related and suggested topics.
To contrast, when the date of the last post is clicked you’re brought to the top of the last post (which I think makes sense as-is)
This was adjusted for mobile recently (Jump to last post does not jump to correct position and does not hide jump tool after scrolling), but the issue persists on desktop.