Does the magnet on the case interfere with the digital compass on my iPhone X ?

My iPhone 6s has a non Apple PU leather case with a magnetic closure similar to this Apple product. The magnet interfered with the Digital Compass to the extent that it would read anything from 10° to a whopping 180 ° out. Not good for cross country work.

iPhone X Leather Folio

iPhone X Leather Folio

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