I need to add to the original post and this situation is quite bad unless there is some setting that can fix this issue.
What I am finding is that everything that is mirrored whether the mirror part is created from using Save Part/Mirror or if it is mirrored from Assembly is that the resulting model file is rotated 180 degrees from where it really is.
In other words, the mirror did propagate in the correct orientation the issue is that the model file generated from the mirror is in the wrong orientation.
The way that I discovered this was by bringing the generated model file into Pro Mold and seeing that the model was rotated 180. I also noticed this issue by bringing another model into the generated mirror model file and seeing the orientation 180 degrees opposite of it's true orientation.
Even though I built my own Datums and Csys for my default part, assembly and Pro Mold they all line up with each other. This lines up with the spin center orientation. When I output data it is in true orientation with our other CAD system.
I don't understand how a mirror generated model file would rotate out of position. I'm hoping someone understands what needs done to straighten out the issue.