Thanks for providing these details!
I did now manage to reproduce the problem you have described on Windows when trying to import files via
n8n import:workflow --separate --input=test that were previously exported via
n8n export:workflow --all --separate --output=test:
The same command works fine on Linux:
Based on this I suspect this could be a problem with the CLI not looking in the right path here. I’ll take a closer look this afternoon and see if I can come up with a workaround here.