Thanks for updating this.

It's probably worth keeping the tracktype=grade2 tag where it's been mapped, even where it isn't a highway=track. It potentially gives useful information to routing software.

https://wiki.openstreetmap.org/wiki/Key:tracktype

If you're updating public rights of way in your area, you might find this resource useful:
https://osm.mathmos.net/prow/progress/bucks/-/downley/