Reproduction steps:
1. Open the attached “IN-115988.zip” project
2. Open the “SampleScene”
3. Enter Play mode and wait a few seconds
4. Observe the Console

Expected result: No errors
Actual result: “Invalid SortingGroup index set in Renderer” errors

Reproducible with: 2023.3.0b9, 6000.0.58f1, 6000.2.5f1, 6000.3.0b2
Not reproducible with: 2023.3.0b8 (only other errors are present)

Reproducible on: Windows 11, macOS 15.6.1 (M1 Max)
Not reproducible on: no other environments tested

Note:
- This is a stress test for a real-world scenario: “Invalid SortingGroup index set in Renderer” is triggered by the object pool where it can end up returning an object to the pool and pulling it out in the same frame (ie, multiple enable/disables per frame, together with re-parenting the object