Multi platform solution - There is already a link to the same file

I have no experience in developing for multiple platforms so far. So I thought I would first try to reuse all content as I plan to first start with a 2D project. Priority is Android to get some experience for mobile. But then again I thought well its MonoGame why not try to target more platforms?

I am sure it has to do with the targets file

``` where the MonoGameContentReference build action is defined which is for some reason only accepted by normal MonoGame platform projects. But I have no idea why it does not work for the shared project. Check this post in this older thread here: 
[http://community.monogame.net/t/content-in-shared-project/8791/2?u=kwyrky](http://community.monogame.net/t/content-in-shared-project/8791/2?u=kwyrky) 
I tried that with no success. So as I said I can exclude the Content.mgcb file from the shared project and I can in fact load content defined in there for some reason it does work regardless if it is included or not in the solution.  
What is also confusing for testing this is that I can include the Content.mgcb and I dont have any warnings at all. Also no warnings after clean solution, rebuild solution, compiling etc. Only after closing and reopening Visual Studio they do appear again but again only if the Content.mgcb was added before closing.

So this is version 3.7.1.189. Should be tested maybe with the latest dev. Maybe this got fixed already?