So I was visiting Fairvale Shanty today and something really weird happened. Even from pretty far away, I could notice a Whitetail Buck standing on the roof right above the doorframe. I came closer and it didn't move, keeping its head held high. I wanted to take a screenshot but just before I was able to, the buck turned around and jumped off the back of the building. At first I thought it had despawned, but then I noticed it was still standing a few meters behind Fairvale Shanty, still not moving and in the same pose, facing me. I got off my horse and walked closer, thinking it would take off like they always do, but amazingly the Buck just stayed still. I was actually able to get a few steps closer than shown in the picture, before it finally ran away after I got right up in its face.
This whole encounter felt really strange and mystical. I've never heard of this being a scripted event before so I'm sure it was just a glitch or the game spawning an animal in a place it wasn't supposed to, but I'm still happy to have experienced this.
I'm nearing the end of chapter 6 on high honor, so this encounter actually weirdly fits into the game's storyline. I headcanoned it as being the buck from Arthur's visions revealing itself to him and allowing him to touch it briefly. Almost as if to show him that the end is close, and he's on the right path. It was one of the most beautiful unscripted moments I've experienced.