Compact does not work with tiered tables. In test/suite/hook_tiered.py, there is a function that replaces a compact call to make it silent if we know it won't work with tiered tables. However, this test relies on a URI but the background compaction server does not take any uri, hence the call fails. As background compaction does not directly perform compaction, it is fine to let the call happen with tiered testing. Any underlying compact calls will be silenced by the check.