Steps to repro:
1. Download the Archviz Interior Pro vol 7: https://ono.unity3d.com/test-data/gi-tests/ArchVizPRO-Interior-Vol7 and sync to the revision 2c64f1d00ac5
2. Open the AVP_Vol.7_Standalone scene;
3. In the Lighting window set the Lightmap size to 4k and enable Progressive Updates checkbox;
4. In the Lighting window set the Lightmapper to Progressive GPU and enable Optix denoiser for all types of baked data;
5. Bake the scene’s GI by pressing Generate Lighting button in the Lihghting window;
6. Notice that the fallback to CPU happens with CL_OUT_OF_RESOURCES error;
7. Stop the GI baking after the fallback to CPU has happenned;
8. In the Lighting window set the Lightmap size to 2k;
9. In the Lighting window set the Lightmapper to Progressive GPU;
10. In the Lighting window expand the dropdown on the right side of the Generate Lighting button and select Clear baked data;
11. Bake the scene’s GI by pressing Generate Lighting button in the Lighting window.

Expected result:
The GPU PLM's baking proceeds and finishes without crashes or errors.

Actual result:
Editor and GPU crashes. The following error is shown:
"Failed to present D3D11 swapchain due to device reset/removed.This error can happen if you draw or dispatch very expensive workloads to the GPU, which can cause Windows to detect a GPU Timeout and reset the device. (see https://docs.microsoft.com/en-us/windows-hardware/drivers/display/timeout-detection-and-recovery).If you believe this error is due to built-in Unity functionality, please submit a bug.This is an unrecoverable error and the editor will shut down.". Sometimes the OS freezes completely.

Regression introduced in Unity 2021.2.0a6.

Notes:
- Reproducible in Version 2021.2.0a6 (0048a9ca9c0b);
- Not reproducible in 2021.2.0a5;
- Reproducible on Windows with NVIDIA GeForce RTX 2080 Ti with 11 GB of VRAM with the latest NVIDIA drivers ver 461.40.