Huawei P20 Pro touchscreen stop working once a magnet is touching the back of the phone

I had just purchased a Huawei P20 Pro last week.
I use the magnetic holder to hold the phone. I put the metal on the case and not on the phone.
I found out that, if I was to put the magnetic holder somewhere near the rear camera area, then the touchscreen will stop working, while the fingerprint reader still function as normal.

As soon as I move the magnet away from this particular area at the back of the phone, the touchscreen back to normal functionality. But as soon as I move the magnet...

Huawei P20 Pro touchscreen stop working once a magnet is touching the back of the phone

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