Is the disappearance of the pusher when zooming out a GSX-Pro issue or an MSFS issue?
And how to fix it?
Looks like there’s a missing LOD model in the tug. When you zoom away from the model the LOD changes. It looks as though there’s one missing in that model (maybe by design- maybe not) but you’d need to ask the developer as that doesn’t look like a default MSFS model. 
This is probably the GSX-Pro model. That seems to be their problem.
Was there ever any resolution for this.
I am getting this happening a lot.