How do the two USB ports on the Xiaomi Pad Mini work?

The Xiaomi Pad Mini has two USB-C ports with distinct behaviors.
For your reference, here is more information about the two USB ports:
  1. When connecting headphones to both USB ports on the Xiaomi Pad Mini, due to Android certification, only the last audio device plugged in is active. Simultaneous playback from both ports is not supported.
  2. The USB ports cannot charge simultaneously. The first connected charger takes effect, with a maximum speed of 67 W.
  3. Connecting the two USB ports with a USB-C cable is not a supported use case. Reverse charging can trigger the charging display, but the current is disabled to prevent rapid battery drain.

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