For what it's worth, anything attached to the valve stem, such as extenders and sensors, is another place to leak air. The only air loss I ever dealt with on tires was when a sensor I added leaked. My solution, put sensors inside tires or don't use them. I carry a short braided hose to use for checking tires which I attach temporarily to the inside dual to check it. Takes a moment to do, but seems to work for me.
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