logi Yea I noticed the issue with the expanders as well. I'll see if it is an issue with a newer Plata release and if so, I'll file an issue with Tista. Regarding the icons, I'm not entirely sure if this is an issue on Tista's end, Papirus', an issue in libgtk-3 (3.24.x), librsvg, etc. so I'll keep digging.
But yea, sorry Adapta is bork. It just isn't viable for me to maintain that and backport / re-add changes for Plata into effectively our soft fork, there just isn't enough time in the day for it, and nobody else has stepped up (at least, in an obvious way) to take over Adapta development. So naturally as changes occur in GTK, various applications, and desktop environments, the experience will continue to degrade. It was the same way with Arc for a while until that was picked up by someone else.
