Apparently I found the problem... NEVER name a file "sage.py" in the same folder of the notebooks, it will only create a conflict with the package "sage" from SageMath, and think that the file "sage.py" is the package that must be used... don't know if there is a work-around this to warn users or if there is a way to tell the kernel to alway prioretize the file from it's source folder.
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