Xporter Post Function stops working if you change the Template base file type

Xporter Post Function stops working if you change the Template base file type.
Steps to reproduce:

• create a Post Function and define the template to use;
• if your template was a docx file, change it to a xlsx file, or vice-versa.

The post function will stop working, and the file won't be generated.
Maybe, we can stop the change from happening as we stop the template from being deleted when it is being used on a Workflow Post Function: