Page 675 Daishain’s 5e D&D Rules Q&A Support The Protector. says...
In the meantime though, for my familiar would roll on stealth to "Blend" in.
So as not to stand out like a mini black dragon in the blue sky.
Unfortunately Cinder, your correct, not automatic, blend in, stealth like for my familiar.
I will use him, for this type of mission, if you feel necessary for the group, though.
Yep, I admit the divine sense a bit underrated, not really useful or effective out in the open. Maybe I will wait until, he is traversing caverns?