In Bemidbar 26:55, G-d tells Moshe that the land should be apportioned by lottery. I.e., no tribe was to know or choose its section of land, in advance.
Yet, we see that Moshe gives the tribes of Reuevn, Gad and 1/2 tribe of Menashe the land conquered from Sichon and Og on the east side of the Jordan river. (See Bemidbar 32:33).
Why was Moshe allowed to assign the portion of the land without obeying G-d's command that the land should be assigned to all the tribes by lottery? Was that command specific to only the land on the west side of the Jordan?