Build fails to compile when using a serialized class

Unity: Scripting

2021.3.X

2020.3.X

2021.3.5f1 seem not impacted after all

2020.3.36f1 does not seem to have the issue (built from 2020.3/staging). A PR might have been backported since the issue was submitted.

Reproduction steps:
1. Open the user's attached project
2. Go to File > Build Settings and press Build And Run

Expected result: Build compiles successfully
Actual result: Build fails to compile

Reproducible with: 2020.3.33f1, 2020.3.35f1, 2021.3.3f1
Not reproducible with: 2019.4.39f1, 2020.3.32f1, 2022.1.0a1, 2022.1.2f1, 2022.2.0a15

Reproducible on: Windows 10

Note: Reproducible with IL2CPP and Mono Scripting Backend