read<std::string>() returns all but the last character of a string

[nettels]

New to HighFive, I am trying to read some of the photon hdf5 example data from this site: http://photon-hdf5.github.io/

My code writes GROU instead of GROUP to the console.

HighFive::File file("test.hdf5", HighFive::File::ReadOnly);
std::cout << file.getAttribute("CLASS").read<std::string>() << "\n";

HDFView shows me for this attribute:

Name: CLASS
Type: String, length=5, padding=H5t_STR_NULLTERM, cset=H5T_CSET_UTF8
ArrayType: Scalar
Value: GROUP

Why is read<std::string>() not reading the last character while HDFView is doing it ?
I am useing HDF5 1.14.4 and the latest HighFive on Windows.
Thank you for your help!