Hi Jibin,
I have refreshed a few times and cleared cache, using sapui5 1.36.10. But it returns true still.
Finally I have done an alternative - I have two models. So for one I use attachRequestCompleted to acknowledge that the model is populated, then calls bindProperty on the component for another model.
For 3 models, I am out of ideas! Without document from SAP mentions that Expression binding works for JS view, it is a grey area. I do hope SAP provides some examples on how expression binding works on JS view.
Thanks!
Agatha