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As per discussion item 394486 from iLMax, the TrackFrame class does not comply with the ID3 v2.3 spec.
According to the spec:
The 'Track number/Position in set' frame is a numeric string containing the order number of the audio-file on its original recording. This may be extended with a "/" character and a numeric string containing the total numer of tracks/elements on the
original recording. E.g. "4/9".".
Current, ID3.NET implements this frame as a NumericFrame, meaning that it will fail when the extended format is used.