Adjacent Map Drop Chance

With the Wandering Path keystone and enough Adjacent Map Drop Chance smalls to reach over 100% chance allocated, I have gone through and tested several maps to 0 monsters remaining with no league mechanics left, and I have on multiple occasions received 0 adjacent map drops.

I have never had 0 maps drop, but more than not, none of the dropped maps are adjacent maps.

Loot is broken right now, i also have trouble to sustain maps.

The issue isn't with map sustain. I'm actually fine on sustain. The issue is that the "one monster" that drops the "adjacent map" is malfunctioning in some way.

Either it isn't dropping specifically an adjacent map, or the monster is being erased (by some league mechanic such as Delirium or Blight) instead of being killed.

I actually don't think it preselects a monster though, so I am guessing it's the first one. My guess is that the map drop is rolling like a normal map instead of being limited to adjacent only, since I have yet to have 0 maps drop entirely.