Loading a scene with a large amount of light probes causes a performance spike

Steps to reproduce:

1. Download and open user attached project (lightmaptest.zip)
2. Open the "startingscene" scene & the profiler
3. Start play mode
4. Press "T" key to load using Additive
5. Observe spike in profiler
6. Stop play mode
7. Repeat above, but press "Y" key to load using Single

Notes:

• We thought that is reproduces in 2021.3.5f1, 2022.1.7f1, 2022.2.0a13, 2023.1.0a1, but that was only a "few milliseconds spike", not the "few seconds spike" the user is seeing.
• Both LoadSceneMode.Single and LoadSceneMode.Additive causes a performance spike
• PostLoadSceneStaticLightmapSettings seems to be the culprit (see attached screenshots)