How to reproduce:
1. Download the attached "case_1088730-ShadowCascadeCulling.zip" project and open in Unity
2. Open "SampleScene" scene
3. Enter Play mode
4. Check Shadow casters count either in the Stats or the Frame Debugger
5. Switch to Built-in Pipeline by removing the Lightweight or URP Asset from Graphics settings
6. Change the "New Material" shader to "Standard" from "Universal Render Pipeline/Lit"
7. Check the Shadow casters count again in the Stats or the Frame Debugger

Expected results: the Shadow caster count should be the same as they have the same settings
Actual results: in the Built-In Pipeline there is a number of extra shadow caster draw calls (832 shadow casters) compared to LWRP/URP (0 shadow casters)

Reproducible with:
LWRP 4.10.0-preview (2018.4.23f1) (824 shadow casters instead of 832),
URP 7.0.1 (2020.1.0a11),
URP 8.1.0 (2019.3.16f1, 2020.1.0b11, 2020.2.0a13)

Could not test with: 2017.4 due to URP not being available

Note: reproducible on both OSX and Windows