Viewport culling with deform modifier

In blender 2.8.

With any deform modifier and enable 'Display modifier in Edit mode'.

Then go to edit mode.

I can see both the deformed object and the editable object in original position.

But if I change the viewport and let the deformed object placed outside of the viewport.

The editable object will also disappear!

The editable object is culled from the viewport but I want it stay at where it is.

This behavior seems only happen in blender 2.8.