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two-sided foliage raytracing problem. Please can someone help me here?

Hello,
I use the 4.26 stable and have there the problem that two-sided material foliage makes problems.
There is simply no translucency displayed. Even if I set via console all features to 1 in which two-sided in the name contains.

However.

If I move the whole thing by 3 via world position offset, it looks like the mesh is copied and the translucency is displayed normally there.

if I switch on evaluate world position offset in the mesh, however, the double mesh disappears again.

raytracing translucency is switched on and must remain switched on in this project.

Does anyone have an idea how I could fix the problem?