Reproduction steps:
1. Open the “ProjectBackExtension” in a file explorer
2. Navigate to “Assets/_Project/_Artem/Scenes/RestoredScenes/”
3. Select the “_A_Tutorial_Part2.unity” and the “_A_TutorialStage.unity”
4. Right-click on one of them and select “Get Info”
5. Observe the size of each file

Expected result: The two scene files are not large in size
Actual result: The “_A_Tutorial_Part2.unity” file is 63,3 MB and the “_A_TutorialStage.unity” file is 35,6 MB

Reproducible with: 2021.3.21f1, 2022.2.12f1, 2023.1.0b9, 2023.2.0a7
Could not test with: 2020.3.46f1 (error CS8701: Target runtime doesn't support default interface implementation)

Reproduced on: Intel MacOS 13.2.1

Note: I also tested on a blank project but was not able to reproduce the issue with 100 “Cube” GameObjects or 100 prefabs of a “Cube” GameObject