UE 5.5 here and issue is still present.
Unfortunately the PlatformUserId is not the only issue here. In my setup of keyboard and 2 XBOX Series Gamepads (Wireless + Wired) only recognizes 2 DeviceIds and thus creates 2 PlatformIds on start. Sometimes it recogniezes 3 DeviceIds and third one is a None which is although Connected. Changing focus on window also changes the Gamepads assignments. I spent 3 days on this and I can only call it a disaster.
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