This is something which I don't like about the Mandai parks. They convert original exhibits to display some other species instead of creating new exhibits by making use of empty spaces. Woylies are a good addition though. But I would've liked to see the sugar gliders on display as well. The same goes for the exhibit of Senegal bushbabies as well. Also, is night safari not interested in acquiring species held formerly at the park like Asian golden cats, Malayan civets, and giant flying squirrels?
@Chapman'szebra Building new exhibits cost money and most zoos, including those at Mandai were impacted financially by the pandemic. For the Asian species you mentioned, there aren't sustainable global species management programmes for them, which is an important criterion for Mandai in considering which species to keep.