Newly collected set pieces do not show as collected until reset. Currently every time a new piece is collected a UI reset is required to see the updates. This is the single most disruptive issue for me.

In the case pictured below the chest was collected, shows as highlighted on the left but not in the chest slot on the viewing window on the right. Upon /reset the chest slot showed highlighted in the viewing window and upon mouseover un-highlighted properly and sows as collected.

Same here. Happens with every new item.