Problem with deprecated frames in ID3 tag conversion

I'm forcing the conversion of ID3 tags from ID3v2.3 to ID3v2.4 and viceversa, but sometimes it isn't able to complete the conversion fired with:

[AudioFile].getTagAndConvertOrCreateAndSetDefault()

This is the stacktrace:

    java.lang.ClassCastException: org.jaudiotagger.tag.id3.framebody.FrameBodyDeprecated cannot be cast to 
org.jaudiotagger.tag.id3.framebody.FrameBodyUnsupported at 
org.jaudiotagger.tag.id3.ID3v24Frame.createV24FrameFromV23Frame(SourceFile:199) at 
org.jaudiotagger.tag.id3.ID3v24Frame.<init>(SourceFile:255) at 
org.jaudiotagger.tag.id3.ID3v24Tag.convertFrame(SourceFile:423) at 
org.jaudiotagger.tag.id3.ID3v24Tag.addFrame(SourceFile:361) at 
org.jaudiotagger.tag.id3.AbstractID3v2Tag.copyFrames(SourceFile:262) at 
org.jaudiotagger.tag.id3.ID3v24Tag.<init>(SourceFile:530) at 
org.jaudiotagger.audio.mp3.MP3File.setID3v2Tag(SourceFile:811) at 
org.jaudiotagger.audio.mp3.MP3File.setTag(SourceFile:1138) at 
org.jaudiotagger.audio.mp3.MP3File.getTagAndConvertOrCreateAndSetDefault(SourceFile:1199)

Inside the ID3v24Frame.java, is casting the frame to FrameBodyUnsupported. Shouldn't be added something like that?

// Unknown Frame e.g NCON or TDRL (because TDRL unknown to V23)
        else
        {
            if(frame.getBody() instanceof FrameBodyUnsupported) {
                this.frameBody = new FrameBodyUnsupported((FrameBodyUnsupported) frame.getBody());
                this.frameBody.setHeader(this);
                identifier = frame.getIdentifier();
                logger.finer("V3:Unknown:Orig id is:" + frame.getIdentifier() + ":New id is:" + identifier);
            } else if(frame.getBody() instanceof FrameBodyDeprecated) {
                this.frameBody = new FrameBodyDeprecated((FrameBodyDeprecated) frame.getBody());
                this.frameBody.setHeader(this);
                identifier = frame.getIdentifier();
                logger.finer("V3:Deprecated:Orig id is:" + frame.getIdentifier() + ":New id is:" + identifier);
            }
        }

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