How to reproduce:
1. Open the user's attached project "ReflectionProbeTest-2021.zip"
2. Open Assets/ReflectionProbeTest/Scenes/main.unity
3. Enter Play Mode
4. Press space to load another Scene
5. Open Profiler window (Window>Analysis>Profiler)
6. Take Memory Sample (Memory>Take Sample)
7. Notice 1 Reflection Probe in Assets>Cubemap
8. Repeat steps 4-6
9. Notice 9 Reflection Probes in Assets>Cubemap
10. Repeat steps 4-6

Expected results: There is 1 Reflection Probe in Memory Sample
Actual results: There are 9 Reflection Probes in Memory Sample

Reproducible with: 10.6.0 (2020.3.17f1), 11.0.0 (2021.1.19f1), 12.0.0 (2021.2.0b9, 2022.1.0a6)
Could not test with: 2019.4.29f1 (compilation errors in the Console window)