Note: This happens because all the strands generated by Multiplier modifier have the same root position. The solution is to spread the roots a little bit using the parameters in the Multiplier mod.
Hi, this is the conclusion about the baking issue with the Detail modifier:
We don't support baking with varying point counts yet. For now <span>make sure point count doesn't change when baking. You can add the Detail mod on top to change the point count. </span>
