Single Player/PC/Mild/Custom Game:

Crow lands like a bomb, drops feathers without fail, Chats up a storm......but cannot be seen. Probably just a glitch the Obsidian team is working on, but I thought I'd bring it up anyway. Have fun!🙂

Same here, although I was up on the bird bath and was able to see it, perhaps being so close to it. 

In my friend's world, the crow disappears on the lamp structure in the pond. No feather. I hear the landing and the sound, but no crow and feather.

Saw it again, this time up on the northernmost laser. Unless you're within a close distance (20 cm ish), you wont be able to see it.  

Nah, I swam up to the lamp and tried to pinpoint the crowing. Nothing.