Created Unassigned: NPOI.POIFS.Crypt doesn't exist in NuGet package [13206]

I am using NPOI to work with .xls files that are password protected.
According to the GitHub page (https://github.com/tonyqus/npoi/tree/master/main/POIFS), Crypt exists along with all of its files.
BUT on NuGet, where I installed the NPOI package, Crypt does not exist in the NPOI.POIFS namespace.

Is this a mistake? And if so, is it possible to have it added as soon as possible?
Thank you.