well, you're right about the build thing. I checked the latest official build now, and the problem is still there.
As far as I can see, the tags are Apev2. XMMS shows Apev2 in "file info", and also, when I tagged the files with Mp3Tag, I checked in the options that it's going to write it in Apev2 and not in ID3. so both the tagging app and xmms show it's Apev2.