i have had that problem several times too.
I attributed it partly to having 2 large mango trees {i since have installed that mod, making them smaller}
but what are the odds of the collectible being hidden behind the tree that many times

where else could they be hiding?
Actually, before, my collectibles appeared right at the direction the chief pointed, but maybe it was just a coincidence. Even if they show up behind a tree, shrooms and collectibles shine, so you can still find them; and I looked carefully in the orchad.
Hmm, in vv2 we could see the collectibles in the map after enough leveling up. Is it also possible in vv3?