Not a bug. Your number is getting interpreted as the icon number. Look at the line format for a ListView item. See where it says [icon#] and such? That's where MDX thinks you want your number. If you don't want an icon, then you need to put 0 for [icon#] and [state#] and such.
Example:
Wrong: + 0815
Right: 0 + 0 0 0 0815
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