Headphone jack detects a headset when a rubber plug is put in

I'm using a phone accessory that uses the headphone jack, the plug is made of rubber so no electricity involved. Somehow, my Xiaomi Mi4i simply thinks it's a legit headphone plug and routes audio to headphone jack, where I can't hear them.

The same plug works on other devices such as a BlackBerry Z10, SONY PSVITA, and Samsung Galaxy Note, not sure what's wrong here.

Is there anything I can do to get audio to be routed to normal speakers? MIUI 7.2.3 here

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