SampleTexture3D with Fluid

Hi! I would like to use a Fluid for distorting a SDF.
I take the Fluid’s velocity texture and get a 3D Vector with SampleTexture3DBox. But the result looks very rectangular. Not sure if I made a mistake or if there is a problem with the SampleTexture node or if this is related to the Fluid’s resolution.
I did something very similar in beta and it looked very smooth. Would really like to manage it in Gamma. Thanks!

Sorry, I figured out that it was just the interpolation. After switching to Tricubic it looks much smoother.