FluidFlux + Ultra Dynamic Sky blueprint script issue

Hey folks

I’ve got an issue with the water plugin FluidFlux in connection to the Ultra Dynamic Sky plugin:


I’m getting this runtime error concerning the BP_FluxSurface blueprint as soon as I set up Ultry Dynamic Sky in any of the demo maps that FluidFlux comes with, causing collision meshes that are supposed to float on the water surface to fall through.
I raised the issue on the dev’s Discord but didn’t really get any helpful reply yet and since it’s somewhat urgent (client job), I thought I’m gonna try and get some answers here as well.

I saw that the same issue was raised on the Discord channel last year, which got the following solution reply: “pin actor with skylight to Surface->Skylight reference and should work Surface->Skylight is a soft reference on actor so you can use anything”

Coming from Blender, I only recently started on UE5 and just can’t decipher how to execute that advice, so if anyone could help me out here, that would be greatly appreciated!

Here’s an overview of the BP_surface blueprint nodes:
details opening up on clicking the error:


complete overview: