Steps to repro:
1. Pull ArchViz Pro vol.6 project (see the link in the case comments) and sync to the revision 1da1e66b8989;
2. Open 'AVP6_Desktop' scene;
3. In the Lighting window (Window>Rendering>Lighting) enable Progressive Updates checkbox;
4. In the Lighting window press Generate Lighting button.

Expected result:
The GPU PLM bake proceeds and finishes as expected.

Actual result:
Fallback to CPU PLM happens. The following errors are shown:
- Not enough GPU memory to fit an entire lightmap, disabling progressive updates. Available GPU memory : 0 B
- OpenCL Error. Falling back to CPU lightmapper. Error callback from context: Not enough GPU memory to fit lightmap in memory, even in tiled baking mode. Available GPU memory: 0 B
See attached Editor.log and screenshot.

Notes:
- Reproducible in Versions 2022.1.0a11, 2021.2.0b14, 2021.1.24f1, 2020.3.20f1;
- Reproducible on Windows with NVIDIA GeForce RTX 2080Ti GPU (NVIDIA drivers ver. 472.12);
- The issue seems to be project-specific; I haven't managed to repro on other projects so far;
- The issue might not reproduce consistently (in my case, having about 70% reproduction rate);
- Also reproducible without denoising and with a lower lightmap resolution (40);
- Although the issue is not officially a regression, I was able to bake this project successfully in the previous versions, so it might be caused by some backport that introduced it in latest LTS and tech stream Editor versions;
- The issue might be related to the GPU drivers;
- In some cases executing aforementioned repro steps it might lead to either Editor crash or to the different errors shown during the fallback to CPU PLM (see case comments);
- Restarting Editor or even OS doesn't fix the issue;
- Closing other applications that might occupy some RAM doesn't fix the issue.