Reproduction steps:

1. Open "Test.zip" project
2. Open "Test" scene
3. Enter Play mode
4. Look at the Console window
5. Notice that the cache is cleared and when checking if an object is cached, the result is 'false'
6. Notice that after downloading the Asset Bundle, checking the cache results in 'true'
7. Notice that after the cache is cleared, checking the cache, results to 'true'

Expected Result: After clearing the cache, the "IsVersionCached' should result to 'false'
Actual Result: Sometimes clearing the cache, doesn't actually clear the cache

Fixed in: 2018.3.0a6

Reproduced with: 2018.1.0b3, 2017.3.0p2, 2017.2.1p2, 2017.1.3f1

Note:
2017.3 and down - "Downloaded, true.PNG" the second cache check results to 'false'
2017.2 and down - "cleared, true.PNG" the first cache check results to 'false'