DHmY: Rambam Rules in Accordance with Yerushalmi -Berachos 48b
The Rambam in Hil. Berachos 4:6 rules that the bracha on a parperes (an appetizer for which the bracha is mezonos) does not exempt maaseh kedeira (a porridge or the like, for which the bracha is also mezonos). The Nosei Kelim are really concerned with this, and the Rambam's own grandson wanted to change the girsa in the halacha - because in the Bavli it is never resolved, and we should therefore say safek berachos l'kulla.
However, Gilyonei HaShas here and Aruch HaShulchan 176:1-2 both clarify: Whenever the Bavli has a safek, but the Yerushalmi is definite, the Rambam will rule according to the Yerushalmi. The Aruch HaShulchan says this is so obviously the Rambam's derech (and other Rishonim, see the AhS there), that the Rama, who does not rule accordingly, must not have seen the Yerushalmi here, but that the Yerushalmi is "ikkar l'dina."