Hey, IvanRodriguez
This issue has been backlogged as of recently. Currently there are resources dedicated elsewhere for the final push of 4.9 which is focused on stability. I will add some community interest to the issue so this can be a target for 4.10.
The workaround below is easy enough and works well. If you are spawning the Wind Directional Source actor, simply update its rotation (even by 1 degree) and your wind will update its speed and strength to the correct values.
Cheers,