Hi, Notch Team.
I think I’ve pinned down what causes the problem discussed here: https://www.notch.one/support/forums/topic/bug-clone-to-mesh-in-uv-mode-vertex-color-random-color-flickering/.
The flickering reveals itself only with the 3d Grid toggled on for the view-port. The clones pick up the flickering blue and grey color from the blue axes and the grey lines of the grid.
Please, check again. Thanks.
-Andy
Well that was an interesting one…! Thanks for tracking that down.
(The technical reason is - the objects connected to the Clone To Volume were rendered by using a filter. The grid was incorrectly marked in some situation so it got included in that filter.)
Clone To Volume? Hmm… I thought the original problem was with the Clone to Mesh Node in UV mode… But anyway, thanks for reverting to this issue. I hope the filter is now fully fixed 
It affected both.
I see. Thanks. My bad. I didn’t give the Clone To Volume enough love then 