Rain goes though custom animations

[Keyran]

I have tried to create a periodic rain effect with a static custom animation that is placed above the track and appears and disappears from time to time. Despite a huge NCP, it doesn't stop the rain.

Is it planned to fix this? Is it a known issue?

I know there are other ways to make rain start during a race (School's Out! 2 R has it), but the rain can't stop in this case.