The previously rigged models doesn't show up in blender 2.8 or above versions. unless or until you go to edit mode or unparent the object (by using outliner). there is just a dot if you zoom-in pressing numpad del button. It so frustrating that I have to re-parent adjust the weight again.
Blender 2.8 is under heavy development and many features like modifiers are missing. It's too early to report those types of issues, this is too much of a work in progress still.
In the future when reporting bugs, please also provide all the requested information since it's difficult to guess how you might set up the scene.