cacheStaticShadows property
Whether nodes marked shadowStatic are cached across frames.
Disable this for a light whose direction changes every frame. Rebuilding and replaying cached tiles would add work compared with rendering all casters directly into the frame atlas. A light that turns in small, occasional steps (a stepped sun) can keep it on; each step refreshes the cached cascades one per frame, so far cascades lag the turn briefly.
Implementation
bool cacheStaticShadows;