Crash on CreateCollidersFromPrototype when entering Play mode with a tree prototype defined and in the scene but no instances painted

How to reproduce:
1. Open the attached “IN-118699” project
2. Open the “SampleScene“
3. Place the “Cube” Prefab anywhere in the scene
4. Enter Play mode
5. Observe the crash

Reproducible with: 6000.2.6f1, 6000.2.7f1, 6000.3.0b5, 6000.4.0a1
Not reproducible with: 6000.0.59f1, 6000.2.5f1

Reproduced on: Windows 11
Not reproduced on: No other environment tested

Note: Also reproducible on a fresh project using any pipeline

First few lines of the stack trace:
0x00007FFF8A1CA238 (Unity) CreateCollidersFromPrototype
0x00007FFF893D5CF5 (Unity) ujob_execute_job
0x00007FFF893D7B6E (Unity) ujob_wait_for
0x00007FFF893D0DB7 (Unity) CompleteFenceInternal
0x00007FFF8A1CA6E2 (Unity) TerrainCollider::CreateTrees