Please have a look at the PyAEDT examples, especially the example concering EDB creation:
https://aedt.docs.pyansys.com/version/stable/examples/index.html
This should give an idea about how to properly create an EDB using automation. If you think there is an issue with PyAEDT, please file it here:
https://github.com/ansys/pyaedt/issues
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