Same issue here and to me BMW says no way, because of idiot importer delegate says to the BMW factory that these are from stone chips what is not true like we see here.
Here is another thread about it.
E91 318dA M-Sport Le Mans Blau metallic
Do not, under any circumstances, buy the 123d in the M-Sport trim. The ride is far too hard.
If you're relaxed or want a thrash, this motor lets you be as wild or calm as you like.
Top Gear review