Thanks for the reply! Initially the landscape does block the direct line of sight as the NPC begins the level but as he draws nearer, line of sight is clear and should be able to pick it up/see it. If the collision is the issue that would mean that perception will only notice new things that entered the line of sight initially rather than at any point it has a clear view of it.
For your other suggestion I will get back to you later when I’m able to test that. I only tried placing persistent objects to test EQS, not perception.
Thanks again and I’ll get back to you later!