1. Open the newest attached project "case_1311746-982799_expirationDelay.zip"
2. Switch platform to WebGL
3. In the Addressable Group tab, select Build > New Build > Default Build Script to build the asset bundles.
4. Build the WebGL player and named it WebGL
5. Copy the contents of the ServerData/WebGL/ folder generated from step 3 to the root of the WebGL player folder from step 4
6. Copy the entire WebGL folder to the webserver folder (for Windows, you can copy to xampp's htdocs folder)
7. Startup Firefox (or any other browser) and enter "localhost"
8. Clear the cache
9. Open Inspect Elements and navigate to Storage tab > IndexedDB > https://localhost > /idbfs > FILE_DATA.
10. Take a note of the TimeStamp
11. Go back to the Unity Editor and open up the SampleScene
12. Select the Cube prefab from the project window and increase the X scale to 2
13. Go to the Addressable Group tab and select Build > Update a previous build( It will request the addressables_content_state.bin file Select Assets/WebGL/addressables_content_state.bin file)
14. Once the build is done, go to the ServerData/WebGL folder. Please take note of the names of the two different asset bundles here(The new one from step 13 and the old one from step 3)
15. Copy the contents of this ServerData/WebGL to the root of the web server's WebGL folder
16. Look at the storage again
17. Notice that the old AssetBundle is still there

Expected result: The expiration delay should purge the asset bundles within the C# cache of the browser when its expiration time is over(Old Asset bundle is gone)
Current result: The expiration delay does not purge the asset bundles within the C# cache of the browser when its expiration time is over(Old Asset bundle is there)

Reproducible with: 2019.4.20f1, 2020.2.6f1, 2021.1.0b5, 2021.2.0a3
Unable to reproduce: 2018.4(Project breaking)

Note:
-The old AssetBundle will disappear if the cache is cleared
-Notice the newest edit field for more detailed steps and information