So hey, I found a solution that worked for me.
Basically I got the reference to MonoGame.framework from a package.
If you go to the package section of your project, you can right-click to add a package. Search for “MonoGame” and select DesktopGL from the list. After that, I could add the reference to the framework from the package and it worked!
Actually, my project had another project for Nez, and it could not get the same reference. Luckily, by opening this project separately (not being part of my main project’s solution) I could do the same trick to make it work. And by re-opening my solution, Nez was compiling correctly.
I hope it helps y’all!