Serialization produces inconsistent results when accessing it a lot of times

Reproduction steps:

1. Open the attached project
2. Open the “/Assets/Scenes/SampleScene.unity” Scene
3. Enter the Play Mode
4. Click the Button in the middle of the Game View many times
5. Observe the outputs in the Console

Expected result: “K120” message is logged to the Console on each press
Actual result: The outputs are inconsistent and vary from errors to messages like “K䈱2䈰” or “nj120”

Reproducible with: 2021.2.0a18, 2021.2.29f1, 2021.3.12f1, 2022.1.20f1, 2022.2.0b12, 2023.1.0a16
Not reproducible with: 2020.3.40f1, 2021.2.0a17

Reproducible on: Windows 10 (21H2)