Blending real-time shadows with the baked shadows leaves unshadowed space when using distance shadowmask

Reproduction steps:
1. Open the attached project “ShadowmaskBlend”
2. Open Scene “Assets/OutdoorsScene.unity”
3. In the Hierarchy, select the “Sky and Fog Volume”
4. In the Inspector, modify the “Max Distance” property under the Volume component’s Shadow Override
5. Observe the Scene view

Expected result: Realtime shadows and baked shadows blend without leaving unshadowed marks
Actual result: There is a ring of unshadowed area at the outermost cascade

Reproducible with: 2021.3.29f1, 2022.3.8f1, 2023.1.10f1, 2023.2.0b6)

Reproducible on: Windows 11
Not reproducible on: No other environment tested

Note: No reproduction with URP