Expression Maps Not Saving With Templates

I just spent the better part of my Saturday creating expression maps for some of the libraries in my orchestral template and assigning them to their respective instruments. I then saved the template and created opened it again to test it, only to find that the expression maps I had created were no longer assigned to the instrument tracks. They still show up in the “expression map setup” screen, but apparently the information of which expression map was saved to which instrument did not get saved with the project. Have I done something wrong here, or is this a known bug?