Reproduction steps:
1. Open the attached project “HDRP_Project”
2. Open the “Assets/OutdoorsScene.unity” scene
3. Enter Play Mode
4. In the Rendering Debugger Window (menu: Window > Analysis > Rendering Debugger > Lighting > Shadows > Shadow Debug Mode), Select “Visualize Directional Light Atlas”
5. In the Game View, Observe the 4th (upper-right) shadow cascade displayed

Expected result: 6 planes are rendered in the shadow cascade
Actual result: 1 plane is rendered

Reproducible with: 2023.1.0a23, 2023.2.6f1, 2023.3.0b3
Not reproducible with: 2021.3.34f1, 2022.3.17f1, 2023.1.0a22

Reproducible on: macOS(Intel), Windows 10 Pro 22H2

Note: In the Hierarchy Window, switching the “Sun” GameObject Shadow Map Update Mode from ‘On-Demand’ to ‘Every Frame’ or ‘On Enable’, will result in all 6 planes being rendered in that cascade.