donut chart don't show all labels

[MP_123]

Hi all

i have another type of release on the donut, yes, its very very small(i see it on bubble chart for example) next to the other legends but why i can't see the label? i understand i can't see  the color because of the size, but i think i do should see the label. i think this is a bug, what do you think?

thanks a lot