Issue when opening MTCollection and netcdf file in same script

[mmoorkamp]

There seems to be an issue when working with a MTH5 file and a netcdf file in the same script. This minimal example

from mtpy import MTCollection
import numpy as np


mc = MTCollection()
mc.open_collection(r"/home/moorkamp/playground/MSH/eric/msh_edis/T1/tf_collection.h5")
mt =mc.to_mt_data()
mc.close_collection()

from netCDF4 import Dataset

nstat = 2
testdata = np.zeros(nstat)
data_fh = Dataset("test.nc", "w")
statdim = data_fh.createDimension("StationNumber", nstat)
vmeasx = data_fh.createVariable("MeasPosX","f8",("StationNumber"))
vmeasx.units = "m"
vmeasx[:] = testdata
data_fh.close()

gives the error

Traceback (most recent call last):
File "/home/moorkamp/playground/MSH/eric/msh_edis/T1/./minimal.py", line 26, in
vmeasx[:] = testdata
~~~~~~^^^
File "src/netCDF4/_netCDF4.pyx", line 5630, in netCDF4._netCDF4.Variable.setitem
File "src/netCDF4/_netCDF4.pyx", line 5917, in netCDF4._netCDF4.Variable._put
File "src/netCDF4/_netCDF4.pyx", line 2164, in netCDF4._netCDF4._ensure_nc_success
RuntimeError: NetCDF: HDF error

When the order of dealing with the files is swapped (first opening and writing the netcdf file then working with mth5) it works on my system.