As we already know since May, Night Mushrooms around the Magic Shop spawn up in the air.
A few mushrooms used to spawn in the forest too. There are 3 hotspots. But there is a randomizer too. On one hand, the spawn is randomized among the three hotspots. On the other hand, the spawn is randomized in a radius around each hotspot.
And there is an invisible wall too, near one of the hotspots.
Unfortunately, it happened too often now that mushrooms spawned outside of the invisible wall, too far outside to be picked up. They are lost now (until a GM picks them up, temporarily, to get lost again, until this problem gets fixed).