BUG: NPCs collision stops working when far away from a player

General Issues and Bug Reporting
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Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

AI

Summary

I have a Volume Device set up, which is used by another device to detect if NPCs enter/leave the volume. Everything works like it should when a player is near the NPCs. But as soon as all Players are farther away than around 11.000 - 12.000 Unreal Units, you can see that the NPC Models get hidden. As soon as the models get hidden, the volume device stops triggering any Enter/Leave Events and also all NPCs that are currently inside the Volume, trigger the Leave event.

Steps to Reproduce

  1. Create a fresh project
  2. Setup a volume device hooked up to another device to Print an output when an agent enters/leaves.
  3. Setup an NPC Spawner which periodically spawns NPCs which move through the volume device
  4. Observe that the Enter/Leave Events are being correctly triggered when you are closer than 11.000 UE units(and the NPC Models are visible)
  5. Observe that Enter/Leave Events stop working when you are moving farther away and the NPC Models get hidden(at around 11.000 - 12.000 Unreal Units). Also any NPC currently inside the volume device, triggers the leave event.
  6. Observe that the Enter/Leave events start working again when getting nearer and that now more NPCs are behind the Volume Device than before, without triggering any Volume Device events.

Expected Result

NPCs should still trigger collisions when their models get hidden

Observed Result

NPCs don’t seem to have collision anymore, once they get hidden when far away from players

Platform(s)

Probably All, tested on PC