How to overlay a foliage on a blueprint class ?

Development World Creation
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1

Hello everyone. I built a small wall of modules and now, for a change, I wanted to cover it with foliage. The Foliage tool worked perfectly with simple mesh objects, but I decided to use a modular blueprint and build a wall of them. The Foliage tool does not perceive my BP objects, how do I cover them with foliage?

изображение
изображение1497×909 103 KB

Blueprint
Blueprint

2

upd:
Fill tool works correct. Only the Paint tool does not see the mesh.

3

upd:
video with problem: