The seasonal Fae Courts split from the Material Plane and move their lands into another pocket dimension/plane.
The seasonal Fae Courts split from the Material Plane and moved their lands into another pocket dimension/plane. In order to keep the world's land from shifting like when the Celestial Fae Court completely disconnected their land from the globe and into another plane, they kept many small gates and portals between their planes and the Material Plane. This is why the courts still technically appear on the world map, since their lands still "exist" on both planes, yet a person can't simply pass from one to the other without entering a gate or portal. This event shattered much trust between the Spring Fae and their neighboring courts who had not listened to their concerns, as well as the average Spring Fae and their government. The Spring Fae Court began to isolate themselves even from the other Fae Court for centuries after this occurred.