The destructor of InvalidatingLRUCache::StoredValue unconditionally removes entries from the _evictedCheckedOutValues map. This means it is possible that an old ValueHandle, which goes out of scope after a newer value for the same key has been evicted, will remove the newer value from that map. This in turn will prevent such a value from getting invalidated.

The solution is to only erase from the _evictedCheckedOutValues if the StoredValue corresponds to the same epoch for the key.