waterbody has an issue with blueprint

[HamsterIsComing]

I made a blueprint with waterbody as its parent.
There is a issue when I compile blueprint or open level.
Spline is there, but water mesh is gone.

The icon of water body is like this.

Water mesh appears again if I drag spline point.

How can i fix it?

Do I need some kind of update function after everything is done?

[gab_gallard]

I have the exact same issue. No clear solution. Sometimes I fixed it by moving the river a bit on the X axis and then undoing. After a couple of seconds the water appears again. But I feel this works 70% of the time.