2019.1.0f2 / HDRP Reflections

Hi all

I have this litte forest Scene I use to Play around with HDRP.

I have a water plane with a planar reflection probe and a Proxy volume attached.

Somehow the reflection is quite odd at some spots, where the HDRI sky is reflected instead of the Geometrie available.

What could be wrong in my scene?

Is there an actual (up to date) tutorial regarding reflections?

You would have to play with the position of Planar reflection probe.
It is close to impossible to find tutorials for graphics issues in Unity. Anyway, if you find some consider yourself lucky