Short version: you need to use a v2.3 automatic build and to enable caustic cache too.
When official v2.3 will be out?
Thanks for the tips!

Short version: you need to use a v2.3 automatic build and to enable caustic cache too.
Why when you disable Interior Volume from glass the IOR stays the same as in the (Luxcore volume nodes) but refractions are different? Do you have to use Interior Volume with clear glass?