I encountered this same problem. I searched everywhere until I discovered that Linux enviroment is case sensitive.

I changed {% include "partials/partial_add_Initiative.html" %} to {% include "partials/partial_add_initiative.html" %}. Just because of capital letter "I" in initiative, it did not work until I changed it to small letter "i". Windows allows the different letters. Or is there anywhere in the setting one can escape the case sensitivity? I will check.