How to reproduce:
1. Open the user-submitted project
2. Open the scene "Scene_Debug" (Assets/TerrainLayer_Problem/Scene_Debug.unity)
3. Enter and exit Play mode
4. In the Inspector window, select the GameObject "Terrain"
5. Inspect the Console window (Window > General > Console)

Expected result: No errors are seen in the Console
Actual result: Errors, warnings, and messages are spammed in the Console

Reproducible with: 2021.2.2f1, 2021.2.6f1, 2022.1.0a10
Not reproducible with: 2020.3.24f1, 2021.2.1f1, 2022.1.0a11, 2022.1.0a16
Couldn't test with: 2019.4.34f1 (Error: File may be corrupted or was serialized with a newer version of Unity.)

Errors:
TLS Allocator ALLOC_TEMP_TLS, underlying allocator ALLOC_TEMP_MAIN has unfreed allocations, size 112

Warnings:
Internal: Stack allocator ALLOC_TEMP_MAIN has unfreed allocations, size 112

Messages:
Allocation of 56 bytes at 0x13ae00120