Steps to reproduce:

1. Open any scene
2. Open the Task Manager and view your GPU memory utilization
3. Add some probes
4. Crank the lighting settings (such as probe multiplier) to make the allocation sizeable (depending on your GPU). 
5. Make sure you're using the GPU Lightmapper
6. Hit 'generate lighting'
7. Wait until you see the VRAM allocation happening (should be a steep hump in the video memory utilization)
8. Allow the bake to finish (see that the memory is indeed deallocated)
9. Initiate another bake
10. This time, before the `Baking` step is done, but after the allocation has finished, hit `Cancel` in the Lighting Window.
11. Notice how the memory is not cleaned up.
12. Hitting `Generate Lighting` again will allocate even more memory.
13. Repeat generate-cancel as many times as you see fit, it will keep stacking memory.

Notes: The LightBaker process is properly cleaned up. This reproduces only with LightBaker and LightProbes in 2023.2 and 2023.1. It also affects APV.