Joshua 1:12,15 NASB
To the Reubenites and to the Gadites and to the half-tribe of Manasseh, Joshua said,
until the Lord gives your brothers rest, as He gives you, and they also possess the land which the Lord your God is giving them. Then you shall return to your own land, and possess that which Moses the servant of the Lord gave you beyond the Jordan toward the sunrise."
But we still find the the tribe of Dan seeking its inheritance way after the three tribes had returned to the east of Jordan
Judges 18:1 NASB
In those days there was no king of Israel; and in those days the tribe of the Danites was seeking an inheritance for themselves to live in, for until that day an inheritance had not been allotted to them as a possession among the tribes of Israel.
Did the three tribes disregard Joshua's instructions?