A quick update on this topic. I installed the latest daily build Dec 31 2020 20:28:34, Version: 7.0 daily Dec 31 2020 (Mac Catalina, C4D r20). Good and bad results. In the previous daily build, when you changed a setting and any interactive window updated, it would look completely different with most of the displacement gone. Only stopping the render and restarting would fix this.
Now with this version, the displacement updates correctly for a single frame, but NOT with animated displacement. I let the IR and Interactive Viewport render frame one of the previously attached animation. I then went to the last frame and let it render. I placed these two image on top of each other in Photoshop and they look identical. To confirm this, I switched the top layer mode to Difference. Any pixel that is the same will turn black. The image went completely black. No change.
I think this information is already known the Devs, but if I send them a file, I will.
@TomG