WavPack Files

I have some problems with Wavpack files which I wish to tag.
Later on, they are going to be converted to m4a files for use in my iPod.

Some of the wv files have very long names and I thought that I could tag them in id3v1 format with the with the id3v2 box ticked. Also, I ticked the id3v2 only if id3v1 too small option.

Unfortunately, all I appear to get is shortened id3v1 tags

Can someone please advise?

Edit
I'm using version 2.35p

WavPack (notice without 'e') are tagged with ID3v1 or APEv2 tags (no ID3v2) in Mp3tag.

Only the settings from Tags > Ape, Mpc... apply to WavPack