IPR does not update substracted Volumemeshes - C4D R20 macOS

[Core2000]

Thank your for the fast updates of Corona. great Work i love it!

I tried R20 on macOS with the new beta2.
When i start IPR and create some Volumemeshes, the IPR does not update objects that are substracted in the Volumebuilder Object.
I always need to restart IPR.

[Beanzvision]

Hi, Could you possibly supply us with your scene (preferable) or steps to recreate this? Thanks
https://corona-renderer.com/upload