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It's the foam layer from a heater/AC door flap in the climate control system.
Best to search the forums and internet for a fix; not always easy to do. It will eventually affect the performance of the heat directed into the cabin during the winter and the A/C in the summer.
Of course, you could just use tweezers or a shop vac to remove the bits when they appear, and live with it. Worked for me for years.
Just sayin'...........
TO
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