dropping on farmlands

ok be simple
i find the dropping the player on a farmland and turning it into dirt breakin wtever on it issue very annoying espesially in mcpe 0.5.0 where there is only one seed, the melon except wheat.
in a melon farm y always step on a melon and drop on some land. fix this bug plz, at least when players r droppin fron a melon the farmland does not change?