Question Black areas in reflection probe. Why?

Hello,

I tried to set up some reflection probes in Unity 2019.3.13f1 (HDRP) and had some mixed results.
Some of the areas in the reflection probe are black. Someone told me it's because there would be a reflection on a shiny surface and I need to increase the amount of bounces. I can find this setting so I post my problem here.

For better testing I created a new and empty project.

I set up a new scene with all the default settings and only added object and some lights:


Then I added a reflection probe and only changed the type from baked to realtime to see something.
It looks like this:


Why are there black parts instead of greenish areas? Is this the correct behaviour or is there something I'm missing?

Thanks in advance!

 

We need to see your setup.

 

I'm not sure what exactly is needed so I uploaded my test project here (the scene is called "ReflectionProbeTest"):
https://www.dropbox.com/s/370jcwt9lc7aykf/ReflectionProbeTest.zip?dl=0