My sim has collected more than enough collectibles to complete the "Collect 25 collectibles" milestone of The Curator (aspiration shows 28/25), but it is not checked off. I believe my sim went over when harvesting a tree of emotions in the Royal Bath. It seems the script is looking for exactly 25 collectibles, when it should check for at least 25, as there are some collectibles (mostly plants) that you can get more than one at a time.
Version 1.115.216.1030
Edit By Crinrict: Adjusted Title to better reflect the issue
