How to reproduce:
1. Open the attached project from "rubens_uclient_main.zip"
2. Observe the crash
Reproducible with: 2020.3.7f1, 2020.3.25f1
Not reproducible with: 2019.4.34f1, 2020.3.6f1, 2021.2.7f1, 2022.1.0b2
First lines of the stack trace:
0x00007FF70ECC9145 (Unity) scripting_class_get_image
0x00007FF70EC94EFC (Unity) AttributeScanner::AttributeScanner
0x00007FF70ED31280 (Unity) SerializableManagedRef::AssertKlassMeetsRequirements
0x00007FF70EC5C595 (Unity) ManagedMonoBehaviourRef::SetScriptCache
0x00007FF70ED35408 (Unity) SerializableManagedRef::RebuildMonoInstance
0x00007FF70ED5D437 (Unity) PersistentManager::ProduceObject