Bug (no boss spawn in arena)

Bug Report ID: #2,316,168,868

Boss didn't spawn in Excavation Map on arena entry.

I have a T15 wasteland that spawned with no boss. Corrupted, blight, harvest, beyond flame, expedition, one shrine and delirium.

edit: Eagon mission start.

edit: Wow. It's like he spawned invisible and I had to walk over the actual location to wake them up.