The western end of: https://www.openstreetmap.org/way/887360198/history

is marked as: access=forestry which denies biking.

This means, for instance, that routability is not possible from Northwest Express to Yabba Dabba Doo, as the short connection between these is denying biking.

https://wiki.openstreetmap.org/wiki/Key:access gives the example of access=forestry, foot=permissive as an example of where access=forestry should be combined with another access-related tag.

So should that, and the other forestry tracks in this area, have bicycle=yes added? At the very least, it seems implied that that very western end should have this.