After using visibility tool, foliage stuck in air

Development Rendering
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1

I recently applied a landscape mask to my Landscape Auto Material, and created a landscape hole with the visibility tool, then modulated the area a little. Later i noticed that foliage was stacking up into the air.

I already recompiled shaders, used all the landscape tools to erase foliage, but the foliage stays in the air.

ANy idea how to resolve this issue? Thanks!

80341-foliageinair.jpg
80341-foliageinair.jpg1917×1062 157 KB

2

It seems i fixed it with the following action:

Landscape Merge tool. Select affected landscape section, hit CTRL + C then click Clear Gizmo Data (Landscape tool sculpt panel).

3

After re-adding a visibility hole the issue is back :confused:

4

Strange enough, i added a bigger visibility hole, undone it, recompiled shaders, and the foliage is gone.