With respect, Idaho burglary is defined as follows:
18-1401. BURGLARY DEFINED. Every person who enters any house, room, apartment, tenement, store, shop, warehouse, mill, barn, stable, outhouse, or a building, tent, vessel, vehicle, trailer, airplane, or railroad car with intent to commit any theft or any felony is guilty of burglary.
Title 18 Chapter 14 Idaho Legislature Statutes
IRRC the felony burglary charge was a result of a felony being committed while inside. Because the suspect crossed a state line had nothing to do with the charge IMO.