The current entry can be assigned a comment and saved. But try use comment 15 characters long, for example "123456789012345". And then look into Stopwatch list. Your comment is renamed to "123456789012345J". Character "J" is added at end, but why? I don't want it. If you look on details, comment is normal there.
You can try next fun. During writing of comment press key Phonebook and select some item. Your phone will be switched off.