The serialized custom class declaration set to null gets instanced once and then returns to the null state when entering the Play Mode with the Domain Reloading enabled

How to reproduce:
1. Open the “Repro_stripped“ project
2. Open the “SampleScene“
3. Enter the Play Mode
4. Observe the Console window

Expected result: The “OnAfterDeserialize: test is not null“ message is not logged
Actual result: The “OnAfterDeserialize: test is not null“ message is logged once

Reproducible with: 2021.3.40f1, 2022.3.36f1, 6000.0.9f1

Reproducible on: macOS 14.5 (Intel), Windows 11 (User’s)
Not reproducible on: No other environments tested

Workaround: Add the [field: NonSerialized] attribute to the “_test“ field in the “Foo.cs“ script

Note: For the issue to be reproducible the Domain Reloading must be enabled