VSM r.Shadow.Virtual.UseReceiverMaskDirectional Breaks Cache Behavior Overrides

Since 5.7 this CVAR has been turned on by default and it ibreaks / prevents shadow cache behaviour to be set as we used to in 5.6 on meshes when r.Shadow.Virtual.UseReceiverMaskDirectional 1

Most of my work is performance related and the VSM cache viewmode has always been a great tool to find issues and reduce shadow costs, but now it can't be used unless that CVAR is off by default.

I have attached a video explaining and showing what 5.7 projects now behave like in detail - I believe this is not the intended design but would really appreciate some clarity on the topic.

Steps to Reproduce

1. Open a Vanilla 5.7 project
2. Take an Object with animated WPO and set its shadow invalidation behavior to be static. -> Observe shadows continue to move.