Dynamic material .sbsar slider not working in-game

I`ve done some tutorials of dynamic materials with .sbsar files. I made all nodes, compiled and the slider moves, but the changing (rust amount) not applies on the mesh. If I stop and move the slider by myself, the rust amount works. Someone have any idea?

LevelBP and nodes

Zeroed rust amount (stop)

0.5 rust amount (stop)

Rust amount is automated in play mode, but dont apply in-game