How to reproduce:
1. Open the attached project ("TerrainBundleTest.zip")
2. Open Profiler if it's not open (Ctrl/command + 7)
3. Enter Play Mode, wait for the terrain to load, and exit Play Mode
4. In the Profiler hierarchy view search for the keyword "TerrainData.AwakeFromLoad" in the first few frames of the Profiler data

Expected result: TerrainData.AwakeFromLoad does not take 13-19 ms of time
Actual result: TerrainData.AwakeFromLoad takes 13-19 ms of time

Reproducible with: 2020.2.0b10, 2020.3.26f1
Not reproducible with: 2019.4.34f1, 2020.2.0b9, 2021.2.8f1, 2022.1.0b4, 2022.2.0a2

Note:
- If you select the Assets/Terrain and change the heightmap resolution of the terrain to 513 * 513, rebuild the asset bundle that contains the terrain asset (I.e. Go to the addressables group window and perform a rebuild there) and repeat steps 1 - 5, the delay for TerrainData.AwakeFromLoad reduces to less than 5 ms.