It's a new feature added by this commit:
commit 088ead25524583e2200aa99111bea2f66a86545a
Author: Guennadi Liakhovetski <[email protected]>
Date: Wed Dec 6 10:15:40 2017 -0500
media: uvcvideo: Add a metadata device node
Unless it affects userspace apps, it's not a bug.
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https://bugs.launchpad.net/bugs/1832239
Title:
cosmic kernel (and above) provides two /dev/videoX device but there
should be only one video device physically
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