The used-space lazyfilewalker will not run if –storage2.piece-scan-on-startup is set to false. If you disabled it, then you would have re-enabled it or remove the flag since the default is true. For those who previously disabled the used-space scan on startup, your config should be:
--storage2.piece-scan-on-startup=true
--pieces.enable-lazy-filewalker=true
Yes, and it shows that the lazyfilewalker is running.