Since version 232 (including 2.32s) If there is text i.e a title that has has the bracket [ or ] the text is removed if edited within the field. If text is edited in the left side area the text stays in place. If you then edit or click the field the text disapears.
E.G Album Name before click in field: Dido Live [CD/DVD] Disc 2. After click in field: Dido Live Disc 2. (only tested with MP3's)