This only an example. I have this problem in my 3DMD Railings in solid operation.
The problem come out where I use PGON{2} or PGON{3} in solid operation; 3d Hotspos move to absolute coordinate.
I create a simple object attached to replicate the problem.
In the object, where are used PGON{3}, I added an hotspot in 3d.
When the object is used for solid operation the hotspot moves to absolute coordinate.