Wireframes disappear in sculpt mode

Hi guys ,
Wireframes disappear in sculpted areas.
Is this a “works as designed” or still a bug ?:

(win64 build from 10.06.2018)

whats the state of the wireframe slider?

Could also be that the wire-frame is drawn based on base mesh and it hasn’t updated yet to reflect the sculpt change?

wireframe slider is 1 (was the first setting I checked)
But yes ideed it’s an update problem.
When I switch to edit mode and back, wireframes come back.
I guess it will be fixed it in the future