There are 2 conflicting tasks for templates:

1. renamed path to templatePath - that is 100% correct
2. move non-default template parameters to the parameters subnode. The bug is that this task consider path to be the property to keep, while these have just been renamed to templatePath.

Fixing this will require careful writing of update tasks for both 4.0.3 and 4.1.1

workaround: move the templatePath nodedata of your templates from the parameters subnode back into the template node itself.