How long is a collectible on screen? After putting my chief to work, I pick up a child and fly slowly all over the island for about 2 minutes - nothing! I look slowly, check behind people, huts and bushes for the sparkle and have only been successful one in four times. I make at least 4 full circuits of the island during this time, so if they disappear before I get there, it is because they only stayed visible for 10 seconds or less.
This was my biggest complaint with VV2. I have everything but the magenta rare stone, for the last year! I log in at least once a month and search for about an hour. I switch over to one of my daughters' tribes and have found that stone multiple times for their tribes - but NEVER for mine! I have pretty much abandoned the game I spent so much time and effort on because it is too frustrating. I'm one of those people who needs to mark "PAID" to a project and move on, but I can't do that with an incomplete collection.
I was hoping this new ability of the chief would resolve that issue, but I'm not having much luck so far.