We recently came a cross a problem with mirrored components and it's happened a couple of time already.

While working on an assembly with mirrored components all of a sudden (not triggered by any action in particular) a Mirrored Part is asking for the Plane that was used when created. This doesn't make any sence because it is currently opened.

There's no way of fixing this because there is no history (Feature) of the Mirrored Component on the Design Tree.

I did some testing and found that whenever Mirrored Component is created if you go to List References, the References for the Plane Used to create that part is Out-of-Context, even if that assembly is opened in SolidWorks, and there's no way of re-referencing to that plane.

Am I missing something? or is this just how mirrored components behave?