I visited this tentative WHS in June 2017. Uzbekistan was very crafty with this tentative site. They left the very obvious Samarkand, Bukhara and Khiva out of the Silk Roads Sites (no double listing), but then they included all the separate tentative sites put forward in 2008! A sort of fallback position, seeking a series if individual inscription fails!
Of the list I visited the ones near Bukhara: Chasma Ayub Mausoleum and Chor Bakr Necropolis (already reviewed) + Bahoutdin Naqshband Necropolis (photo). I think it would be interesting and useful to have all these sites + other sites in Asia work together to have 1 transnational inscription for all these sites instead of having one series for every country.