xbpch couldn't read all variables in a dataset

[XunZhangNJU]

When I use Matlab read ctm.bpch, and I got these data variables.

however, when using xbpch in Jupyter, I only get DXYP variable
Here is my code:
import sys
import xbpch
ctm = 'C:\\Users\\dell\Desktop\\code\\ctm.bpch.20000120'
ctm_data = xbpch.open_bpchdataset(ctm)
print(ctm_data)
Output in Python:

My QA: where are the other three variables: BXHGHT-$ when using xbpch package? and how to fix this issue?