why can insert 0~7 in the InsertTest1 of DiskExtendibleHashTable

[streamyy]

the directory_max_depth is 2 and the bucket_max_size is 2, so the theoretical upper limit on the size is 8,but the hash value of 0,2,4 is all 0 when the depth is 2,so they will all put in the bucket at index 0,but it's the max depth in directory,so how to put it into the hashtable?