The issue, as I see it, is that using Mp3tag v2.95 for the field ALBUMARTIST I see only one value, ever. Recently I found that some .flac files have two values in ALBUMARTIST, seperated by a semi-colon (see attached screenshot). Mp3tag appears, at least to me, to only show the second value. Using Windows File Explorer I can see both values. I would like MP3Tag to show me when there are multiple values and to allow me to overwrite the multiple values with just the one I want. Is there a way of doing this or am I misusing something?
The extended tags dialogue should show you all incarnations of a multivalue field. So check that first if there are really several fields.
In my MP3tag a multi-value field is displayed as it should with
\\ as separator.