On a somewhat related note. The issue seems to be the total number of collectibles spawning. My memory is foggy on the previous Halloween Events, but if you go to the test server and pay attention the spawns they have so far always been between 10-20 and historically during the Christmas event every spawn was between 20-40. So if this is in fact a bug it will once again come to bite us during that event when to get the achievements we are expected to find 250 of each of the three ingredients. Though there is some reprieve as those can be bought... but this is all speculation at this point.