How to reproduce:
1. Open the “Test.zip“ project
2. Open the “Playground“ Scene
3. Enter Play Mode
4. Observe the Console

Expected result: The Console log reads:
”{ "Single": {},
"List": [ {} ],
"Set": [ {} ],
"Dict": { "Item": {} }
}”
Actual result: The Console log reads:
”{ "Single": {},
"List": [ {} ],
"Set": [ {} ],
"Dict": { "Item": { "$type": "BugReproduction.Item, Assembly-CSharp" } }
}”

Reproducible in: 2021.3.40f1, 2022.3.37f1, 6000.0.10f1

Reproduced on: Windows 11 Pro (23H2)
Not reproduced on: No other environment tested