Heterogeneous Volumes with holes and errors in Path Tracing

Hello and good day!
After scaling Heterogeneous Volumes (SVT/VDB) up ro let them inrtersect with other volumes, after a certain size the >Volumes show holes or get blocky. Purpose is to use Heterogeneous Volumes as clouds over landscapes.
Increasing MaxBottomLevelMemory and decreasing OrthoGridShadingRate didnt help.
Also turning off HomogeneousAggregation did not close holes.

The SVT/VDB was scaled up inside editor with the factor 100.

Path Tracing:

Lit mode:

Thank you in advance and greetings,
Ronald