Joining Realm in splitscreen on XBox loads second player without inventory

The first player who was logged into their account started a split screen session on our Realm. The second player who was logged into their account was started at the world spawn with no inventory. To be clear, the second player was logged into an actual account, not a guest. We then switched: the person who was previously the second player tried logging in to the realm, and their inventory was intact. However, the person who was previously the first player loaded at the world spawn without their inventory.