Foliage landscape


I have a bug when I want to put foliage on my landscape. This is not the first time this has happened to me. I looked all over the net but couldn’t find the answers. I have the impression that foliage does not take new sculpts into account at all.
It is quite visible with my “foliage sphere” which no longer follow the landscape and my foliages float in the air.
I have already tested everything, align to normal, world collision, delete portions of landscape, z offset, preset collision, LOD for the landscape …

I made a video to show :

Any help will be very appreciated !