Share a document with tabs or accordions and the comment pins turned into noise. Every pin from every tab sat on the page at once, and because positions were frozen at the moment you placed them, a closed panel shifted the whole page and dropped pins onto the wrong paragraph.

Pins are now tied to the element you commented on, not a pixel offset. A pin only appears while its element is actually on screen, and its position is measured live, so switching tabs or reflowing the page keeps it exactly where it belongs. Comments on hidden content stay in the sidebar, and clicking "Anchored" on a thread opens whatever tab or accordion is hiding it and scrolls right to the spot.

You can comment across a multi-tab document and only ever see the pins for what you're reading. Comments you placed before this keep behaving exactly as they did.