I believe you need to update the FDTD version to the newest 2022R2.2.
I tested and did not find any issue regarding to the source import.
You may need to have a clean installation: https://optics.ansys.com/hc/en-us/articles/5613618572947-Fixing-installation-or-license-activation-issues
clear all related folders, including hidden folders, restart your computer, reinstall, and test again.
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