Steps to reproduce:
- Select source WMA file with tags that include multiple lyrics in multiple languages (JA and EN).
- Copy tags using right click Tag Copy function.
- Select target WMA file.
- Paste tags using right click Tag Paste function.
- Only one language of lyrics is copied. Language for copied lyrics is no longer specified and becomes system locale (as displayed in other applications). Other lyrics in other languages are lost.
Note: WMA files also support multi-language Comments. I have not yet checked whether MP3tag is handling these correctly. This should also be investigated.