Hi starsep,
That's a good question. I was just focused on correcting the tag name=* and I did not realize that other tags had issues too.
The tag name had "highway=footway footway=sidewalk surface=paving_stones paving_stones=good" as its value and I only removed it.
Going deeper into the object history [1], the user "Jaime Carlos Macuacua Macuacua" added the tag paving_stones=good on this changeset [2]. Try to contact him to get more information, but, if he doesn't reply, imho you can replace that tag key to smoothness keeping his intention.
Best,
[1] - https://www.openstreetmap.org/way/1070407718/history
[2] - https://www.openstreetmap.org/changeset/122478645